Linux ip-172-26-2-223 5.4.0-1018-aws #18-Ubuntu SMP Wed Jun 24 01:15:00 UTC 2020 x86_64
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8.1.13
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[ HOME SHELL ]
Name
Size
Permission
Action
1st.result
597
B
-rw-r--r--
acl_tables_errors_debug.result
8.93
KB
-rw-r--r--
alias.result
13.58
KB
-rw-r--r--
almost_full.result
1.11
KB
-rw-r--r--
alter_table-big.result
5.45
KB
-rw-r--r--
alter_table.result
154.41
KB
-rw-r--r--
analyze.result
3.69
KB
-rw-r--r--
ansi.result
1.92
KB
-rw-r--r--
archive-big.result
616
B
-rw-r--r--
archive.result
525.18
KB
-rw-r--r--
archive_bitfield.result
4.26
KB
-rw-r--r--
archive_debug.result
355
B
-rw-r--r--
archive_gis.result
25.98
KB
-rw-r--r--
archive_no_symlink.result
882
B
-rw-r--r--
archive_plugin.result
531
B
-rw-r--r--
archive_symlink.result
2.3
KB
-rw-r--r--
auth_rpl.result
1.85
KB
-rw-r--r--
auto_increment.result
12.11
KB
-rw-r--r--
backup.result
4.29
KB
-rw-r--r--
bench_count_distinct.result
557
B
-rw-r--r--
big_test.require
17
B
-rw-r--r--
bigint.result
23.33
KB
-rw-r--r--
binary.result
6.09
KB
-rw-r--r--
binary_to_hex.result
5.87
KB
-rw-r--r--
binlog_tx_isolation.result
1.71
KB
-rw-r--r--
blackhole.result
613
B
-rw-r--r--
blackhole_plugin.result
565
B
-rw-r--r--
bool.result
2.67
KB
-rw-r--r--
bootstrap.result
525
B
-rw-r--r--
bug12368203.result
2.77
KB
-rw-r--r--
bug12427262.result
1.86
KB
-rw-r--r--
bug12969156.result
952
B
-rw-r--r--
bug17076131.result
322
B
-rw-r--r--
bug33509.result
2.31
KB
-rw-r--r--
bug39022.result
1.2
KB
-rw-r--r--
bug46080.result
669
B
-rw-r--r--
bug46261.result
353
B
-rw-r--r--
bug46760.result
1.26
KB
-rw-r--r--
bug47671.result
287
B
-rw-r--r--
bug58669.result
480
B
-rw-r--r--
bulk_replace.result
281
B
-rw-r--r--
cache_innodb.result
6.96
KB
-rw-r--r--
case.result
10.63
KB
-rw-r--r--
case_insensitive_file_system.r...
46
B
-rw-r--r--
case_sensitive_file_system.req...
47
B
-rw-r--r--
cast.result
16.27
KB
-rw-r--r--
change_user.result
2.82
KB
-rw-r--r--
charset.result
2.14
KB
-rw-r--r--
check.result
2.05
KB
-rw-r--r--
check_auto_permission.result
261
B
-rw-r--r--
check_var_limit.require
8
B
-rw-r--r--
client_xml.result
2.38
KB
-rw-r--r--
comment_column.result
141.21
KB
-rw-r--r--
comment_column2.result
355.68
KB
-rw-r--r--
comment_index.result
173.32
KB
-rw-r--r--
comment_table.result
28.95
KB
-rw-r--r--
comments.result
2.34
KB
-rw-r--r--
commit.result
14.83
KB
-rw-r--r--
commit_1innodb.result
19.59
KB
-rw-r--r--
compare.result
5.07
KB
-rw-r--r--
compress.result
66.24
KB
-rw-r--r--
concurrent_innodb_safelog.resu...
32.01
KB
-rw-r--r--
concurrent_innodb_unsafelog.re...
31.74
KB
-rw-r--r--
condition_filter.result
2.17
KB
-rw-r--r--
connect.result
11.02
KB
-rw-r--r--
connect_debug.result
1.46
KB
-rw-r--r--
consistent_snapshot.result
1.14
KB
-rw-r--r--
constraints.result
2.56
KB
-rw-r--r--
count_distinct.result
8.04
KB
-rw-r--r--
count_distinct2.result
2.21
KB
-rw-r--r--
count_distinct3.result
278
B
-rw-r--r--
create-big.result
7.6
KB
-rw-r--r--
create.result
71.42
KB
-rw-r--r--
create_not_windows.result
961
B
-rw-r--r--
create_select_tmp.result
846
B
-rw-r--r--
create_w_max_indexes_64.result
84.46
KB
-rw-r--r--
csv.result
59.08
KB
-rw-r--r--
csv_alter_table.result
1.17
KB
-rw-r--r--
csv_not_null.result
1.93
KB
-rw-r--r--
ctype_ascii.result
2.5
KB
-rw-r--r--
ctype_big5.result
34.28
KB
-rw-r--r--
ctype_binary.result
82.78
KB
-rw-r--r--
ctype_collate.result
18.3
KB
-rw-r--r--
ctype_cp1250_ch.result
22.29
KB
-rw-r--r--
ctype_cp1251.result
96.48
KB
-rw-r--r--
ctype_cp932.result
996
B
-rw-r--r--
ctype_cp932_binlog_row.result
734
B
-rw-r--r--
ctype_cp932_binlog_stm.result
251.36
KB
-rw-r--r--
ctype_create.result
3.12
KB
-rw-r--r--
ctype_errors.result
1.66
KB
-rw-r--r--
ctype_eucjpms.result
400.48
KB
-rw-r--r--
ctype_euckr.result
435.54
KB
-rw-r--r--
ctype_filename.result
324
B
-rw-r--r--
ctype_filesystem.result
341
B
-rw-r--r--
ctype_gb18030.result
69.33
KB
-rw-r--r--
ctype_gb18030_binlog.result
909
B
-rw-r--r--
ctype_gb18030_conversion.resul...
1.17
MB
-rw-r--r--
ctype_gb18030_encoding_cn.resu...
41.39
KB
-rw-r--r--
ctype_gb18030_encoding_utf8.re...
40.64
KB
-rw-r--r--
ctype_gb18030_ligatures.result
24.81
KB
-rw-r--r--
ctype_gb2312.result
33.73
KB
-rw-r--r--
ctype_gbk.result
50.07
KB
-rw-r--r--
ctype_gbk_binlog.result
633
B
-rw-r--r--
ctype_hebrew.result
254
B
-rw-r--r--
ctype_latin1.result
119.29
KB
-rw-r--r--
ctype_latin1_de.result
15.74
KB
-rw-r--r--
ctype_latin2.result
13.71
KB
-rw-r--r--
ctype_latin2_ch.result
25.11
KB
-rw-r--r--
ctype_ldml.result
28.13
KB
-rw-r--r--
ctype_like_range.result
80.89
KB
-rw-r--r--
ctype_many.result
41.87
KB
-rw-r--r--
ctype_mb.result
2.13
KB
-rw-r--r--
ctype_recoding.result
9.6
KB
-rw-r--r--
ctype_sjis.result
195.81
KB
-rw-r--r--
ctype_tis620.result
101.02
KB
-rw-r--r--
ctype_uca.result
155.4
KB
-rw-r--r--
ctype_ucs.result
143.96
KB
-rw-r--r--
ctype_ucs2_def.result
1.05
KB
-rw-r--r--
ctype_ujis.result
365.3
KB
-rw-r--r--
ctype_ujis_ucs2.result
548.6
KB
-rw-r--r--
ctype_utf16.result
47.3
KB
-rw-r--r--
ctype_utf16_def.result
273
B
-rw-r--r--
ctype_utf16_uca.result
72.47
KB
-rw-r--r--
ctype_utf16le.result
52.96
KB
-rw-r--r--
ctype_utf32.result
50.55
KB
-rw-r--r--
ctype_utf32_uca.result
75.29
KB
-rw-r--r--
ctype_utf8.result
169.69
KB
-rw-r--r--
ctype_utf8mb4.result
83.57
KB
-rw-r--r--
ctype_utf8mb4_heap.result
75.01
KB
-rw-r--r--
ctype_utf8mb4_innodb.result
77.85
KB
-rw-r--r--
ctype_utf8mb4_myisam.result
77.43
KB
-rw-r--r--
ctype_utf8mb4_uca.result
38.82
KB
-rw-r--r--
daemonize_opt.result
14
B
-rw-r--r--
datadir_permission.result
1.09
KB
-rw-r--r--
date_formats.result
28.69
KB
-rw-r--r--
ddl_i18n_koi8r.result
123.56
KB
-rw-r--r--
ddl_i18n_utf8.result
126.58
KB
-rw-r--r--
deadlock_innodb.result
2.35
KB
-rw-r--r--
debug_sync.result
12.18
KB
-rw-r--r--
debug_sync2.result
1.15
KB
-rw-r--r--
default.result
8.17
KB
-rw-r--r--
delete.result
22.7
KB
-rw-r--r--
delete_all_rows.result
2.26
KB
-rw-r--r--
deprecate_eof.result
8
KB
-rw-r--r--
deprecated_features.result
2.03
KB
-rw-r--r--
derived.result
172.18
KB
-rw-r--r--
dirty_close.result
345
B
-rw-r--r--
disabled_replication.result
4.82
KB
-rw-r--r--
disabled_storage_engines.resul...
3.28
KB
-rw-r--r--
disconnect_on_expired_password...
1.42
KB
-rw-r--r--
disconnect_on_expired_password...
1.49
KB
-rw-r--r--
distinct.result
80.43
KB
-rw-r--r--
drop-no_root.result
454
B
-rw-r--r--
drop.result
6.71
KB
-rw-r--r--
drop_debug.result
485
B
-rw-r--r--
ds_mrr-big.result
2.93
KB
-rw-r--r--
dynamic_tracing.result
813
B
-rw-r--r--
empty_table.result
229
B
-rw-r--r--
enable_cleartext_plugin.result
1.4
KB
-rw-r--r--
endspace.result
7.25
KB
-rw-r--r--
eq_range_idx_stat.result
6.56
KB
-rw-r--r--
error_simulation.result
3.17
KB
-rw-r--r--
errors.result
6.11
KB
-rw-r--r--
events_1.result
28.3
KB
-rw-r--r--
events_2.result
17.79
KB
-rw-r--r--
events_and_binlog.result
297
B
-rw-r--r--
events_bugs.result
40.94
KB
-rw-r--r--
events_embedded.result
86
B
-rw-r--r--
events_grant.result
10.33
KB
-rw-r--r--
events_logs_tests.result
2.37
KB
-rw-r--r--
events_microsec.result
810
B
-rw-r--r--
events_restart.result
4.36
KB
-rw-r--r--
events_scheduling.result
3.11
KB
-rw-r--r--
events_stress.result
2.39
KB
-rw-r--r--
events_time_zone.result
5.4
KB
-rw-r--r--
events_trans.result
3.61
KB
-rw-r--r--
events_trans_notembedded.resul...
1.88
KB
-rw-r--r--
examined_rows.result
6.73
KB
-rw-r--r--
execution_constants.result
1.03
KB
-rw-r--r--
explain.result
39.39
KB
-rw-r--r--
explain_for_connection_crash.r...
1004
B
-rw-r--r--
explain_for_connection_rqg_jso...
87.48
KB
-rw-r--r--
explain_for_connection_rqg_tra...
35.98
KB
-rw-r--r--
explain_for_connection_small_j...
25.46
KB
-rw-r--r--
explain_for_connection_small_t...
10.3
KB
-rw-r--r--
explain_json_all.result
98.36
KB
-rw-r--r--
explain_json_none.result
102.18
KB
-rw-r--r--
explain_other.result
42.23
KB
-rw-r--r--
file_contents.result
181
B
-rw-r--r--
filesort_debug.result
4.59
KB
-rw-r--r--
filesort_merge.result
2.02
KB
-rw-r--r--
filesort_pack.result
675
B
-rw-r--r--
filter_single_col_idx_big.resu...
38.05
KB
-rw-r--r--
filter_single_col_idx_small.re...
42.99
KB
-rw-r--r--
fix_priv_tables.result
1.96
KB
-rw-r--r--
flush.result
13.78
KB
-rw-r--r--
flush2.result
1.06
KB
-rw-r--r--
flush_block_commit.result
1.47
KB
-rw-r--r--
flush_block_commit_notembedded...
872
B
-rw-r--r--
flush_read_lock.result
73.94
KB
-rw-r--r--
flush_read_lock_kill.result
1.12
KB
-rw-r--r--
flush_table.result
12.33
KB
-rw-r--r--
foreign_key.result
4.84
KB
-rw-r--r--
fulltext.result
32.93
KB
-rw-r--r--
fulltext2.result
7.54
KB
-rw-r--r--
fulltext3.result
815
B
-rw-r--r--
fulltext_cache.result
2.67
KB
-rw-r--r--
fulltext_distinct.result
1.45
KB
-rw-r--r--
fulltext_left_join.result
4
KB
-rw-r--r--
fulltext_multi.result
766
B
-rw-r--r--
fulltext_order_by.result
6.05
KB
-rw-r--r--
fulltext_plugin.result
229
B
-rw-r--r--
fulltext_update.result
1.11
KB
-rw-r--r--
fulltext_var.result
1.3
KB
-rw-r--r--
func_aes.result
12.97
KB
-rw-r--r--
func_aes_cfb1.result
4.5
KB
-rw-r--r--
func_aes_cfb128.result
4.57
KB
-rw-r--r--
func_aes_cfb8.result
4.5
KB
-rw-r--r--
func_aes_kdf_hkdf.result
3.94
KB
-rw-r--r--
func_aes_kdf_pbkdf2_hmac.resul...
6.79
KB
-rw-r--r--
func_aes_misc.result
8.46
KB
-rw-r--r--
func_aes_ofb.result
4.47
KB
-rw-r--r--
func_analyse.result
23.09
KB
-rw-r--r--
func_bitwise_ops.result
80.6
KB
-rw-r--r--
func_compress.result
5.46
KB
-rw-r--r--
func_concat.result
4.37
KB
-rw-r--r--
func_crypt.result
2.05
KB
-rw-r--r--
func_date_add.result
3.74
KB
-rw-r--r--
func_default.result
1.45
KB
-rw-r--r--
func_des_encrypt.result
2.68
KB
-rw-r--r--
func_digest.result
122.35
KB
-rw-r--r--
func_encrypt.result
19.82
KB
-rw-r--r--
func_encrypt_nossl.result
7.75
KB
-rw-r--r--
func_encrypt_ucs2.result
1.21
KB
-rw-r--r--
func_equal.result
1.27
KB
-rw-r--r--
func_found_rows.result
285
B
-rw-r--r--
func_gconcat.result
49.9
KB
-rw-r--r--
func_group.result
66.46
KB
-rw-r--r--
func_group_innodb.result
6.07
KB
-rw-r--r--
func_group_innodb_16k.result
693
B
-rw-r--r--
func_if.result
6.29
KB
-rw-r--r--
func_in_all.result
49.27
KB
-rw-r--r--
func_in_icp.result
48.91
KB
-rw-r--r--
func_in_icp_mrr.result
49.21
KB
-rw-r--r--
func_in_mrr.result
48.93
KB
-rw-r--r--
func_in_mrr_cost.result
48.65
KB
-rw-r--r--
func_in_none.result
48.6
KB
-rw-r--r--
func_isnull.result
827
B
-rw-r--r--
func_like.result
7.78
KB
-rw-r--r--
func_math.result
42.22
KB
-rw-r--r--
func_misc.result
36.8
KB
-rw-r--r--
func_op.result
2.12
KB
-rw-r--r--
func_regexp.result
4.47
KB
-rw-r--r--
func_rollback.result
13.02
KB
-rw-r--r--
func_sapdb.result
12.49
KB
-rw-r--r--
func_set.result
8.9
KB
-rw-r--r--
func_str.result
174.94
KB
-rw-r--r--
func_str_debug.result
349
B
-rw-r--r--
func_str_no_ps.result
1.3
KB
-rw-r--r--
func_system.result
2.9
KB
-rw-r--r--
func_test.result
14.47
KB
-rw-r--r--
func_time.result
71.47
KB
-rw-r--r--
func_timestamp.result
518
B
-rw-r--r--
func_weight_string.result
11.56
KB
-rw-r--r--
function_defaults.result
109.58
KB
-rw-r--r--
gcc296.result
528
B
-rw-r--r--
get_diagnostics.result
28.42
KB
-rw-r--r--
get_table_share.result
20.56
KB
-rw-r--r--
gis-debug.result
10.1
KB
-rw-r--r--
gis-precise.result
162.17
KB
-rw-r--r--
gis-rt-precise.result
2.42
KB
-rw-r--r--
gis-rtree.result
102.08
KB
-rw-r--r--
gis.result
131.8
KB
-rw-r--r--
grant.result
121.17
KB
-rw-r--r--
grant2.result
36.52
KB
-rw-r--r--
grant3.result
8.41
KB
-rw-r--r--
grant4.result
9.36
KB
-rw-r--r--
grant_alter_user.result
40.96
KB
-rw-r--r--
grant_alter_user_qa.result
98.38
KB
-rw-r--r--
grant_cache.result
6.71
KB
-rw-r--r--
grant_debug.result
8.5
KB
-rw-r--r--
grant_explain_non_select.resul...
10.27
KB
-rw-r--r--
grant_lowercase_fs.result
1.2
KB
-rw-r--r--
grant_user_lock.result
16.9
KB
-rw-r--r--
grant_user_lock_qa.result
41.4
KB
-rw-r--r--
greedy_optimizer.result
632.59
KB
-rw-r--r--
greedy_search.result
31.05
KB
-rw-r--r--
group_by.result
120.07
KB
-rw-r--r--
group_by_fd_no_prot.result
81.15
KB
-rw-r--r--
group_by_fd_ps_prot.result
61.28
KB
-rw-r--r--
group_min_max.result
189.52
KB
-rw-r--r--
group_min_max_innodb.result
25.09
KB
-rw-r--r--
gtid_next_xa_binlog_off.result
30.9
KB
-rw-r--r--
gtids_anonymous_trxs_violation...
687
B
-rw-r--r--
handler_innodb.result
41.58
KB
-rw-r--r--
handler_myisam.result
45.48
KB
-rw-r--r--
handler_read_last.result
1.15
KB
-rw-r--r--
have_big5.require
79
B
-rw-r--r--
have_binlog_format_mixed.requi...
40
B
-rw-r--r--
have_binlog_format_row.require
38
B
-rw-r--r--
have_binlog_format_statement.r...
44
B
-rw-r--r--
have_compress.require
38
B
-rw-r--r--
have_cp1250_ch.require
79
B
-rw-r--r--
have_cp1251.require
84
B
-rw-r--r--
have_cp866.require
82
B
-rw-r--r--
have_cp932.require
83
B
-rw-r--r--
have_crypt.require
35
B
-rw-r--r--
have_debug.require
8
B
-rw-r--r--
have_debug_sync.require
13
B
-rw-r--r--
have_eucjpms.require
87
B
-rw-r--r--
have_euckr.require
81
B
-rw-r--r--
have_gb18030.require
87
B
-rw-r--r--
have_gb2312.require
84
B
-rw-r--r--
have_gbk.require
78
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Code Editor : innodb_explain_non_select_all.result
set optimizer_switch='semijoin=on,materialization=on,firstmatch=on,loosescan=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=off'; set @save_storage_engine= @@session.default_storage_engine; set session default_storage_engine = InnoDB; set end_markers_in_json=on; #1 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); # # query: UPDATE t1 SET a = 10 WHERE a < 10 # select: SELECT * FROM t1 WHERE a < 10 # EXPLAIN UPDATE t1 SET a = 10 WHERE a < 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 SET a = 10 WHERE a < 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a < 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 33.33 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` < 10) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 4 # Status of testing query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 4 Handler_update 3 DROP TABLE t1; #2 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); # # query: DELETE FROM t1 WHERE a < 10 # select: SELECT * FROM t1 WHERE a < 10 # EXPLAIN DELETE FROM t1 WHERE a < 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 WHERE a < 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a < 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 33.33 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` < 10) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 4 # Status of testing query execution: Variable_name Value Handler_delete 3 Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 4 DROP TABLE t1; #3 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); # # query: DELETE FROM t1 USING t1 WHERE a = 1 # select: SELECT * FROM t1 WHERE a = 1 # EXPLAIN DELETE FROM t1 USING t1 WHERE a = 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 3 33.33 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 USING t1 WHERE a = 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 3 33.33 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a = 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 33.33 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` = 1) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 4 # Status of testing query execution: Variable_name Value Handler_delete 1 Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 4 DROP TABLE t1; #4 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (1), (2), (3); # # query: UPDATE t1, t2 SET t1.a = 10 WHERE t1.a = 1 # select: SELECT * FROM t1, t2 WHERE t1.a = 1 # EXPLAIN UPDATE t1, t2 SET t1.a = 10 WHERE t1.a = 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 33.33 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1, t2 SET t1.a = 10 WHERE t1.a = 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 33.33 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1, t2 WHERE t1.a = 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 33.33 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t1` join `test`.`t2` where (`test`.`t1`.`a` = 1) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 8 # Status of testing query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 8 Handler_update 1 DROP TABLE t1, t2; #5 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (1), (2), (3); # # query: UPDATE t1 t11, (SELECT * FROM t2) t12 SET t11.a = 10 WHERE t11.a = 1 # select: SELECT * FROM t1 t11, (SELECT * FROM t2) t12 WHERE t11.a = 1 # EXPLAIN UPDATE t1 t11, (SELECT * FROM t2) t12 SET t11.a = 10 WHERE t11.a = 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t11 NULL ALL NULL NULL NULL NULL 3 33.33 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 t11, (SELECT * FROM t2) t12 SET t11.a = 10 WHERE t11.a = 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t11 NULL ALL NULL NULL NULL NULL 3 33.33 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 t11, (SELECT * FROM t2) t12 WHERE t11.a = 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t11 NULL ALL NULL NULL NULL NULL 3 33.33 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t11`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t1` `t11` join `test`.`t2` where (`test`.`t11`.`a` = 1) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 8 # Status of testing query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 8 Handler_update 1 DROP TABLE t1, t2; #6 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (1), (2), (3); # # query: UPDATE t1 SET a = 10 WHERE 1 IN (SELECT 1 FROM t2 WHERE t2.b < 3) # select: SELECT * FROM t1 WHERE 1 IN (SELECT 1 FROM t2 WHERE t2.b < 3) # EXPLAIN UPDATE t1 SET a = 10 WHERE 1 IN (SELECT 1 FROM t2 WHERE t2.b < 3); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 2 SUBQUERY t2 NULL ALL NULL NULL NULL NULL 3 33.33 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 SET a = 10 WHERE 1 IN (SELECT 1 FROM t2 WHERE t2.b < 3); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 2 SUBQUERY t2 NULL ALL NULL NULL NULL NULL 3 33.33 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 1 FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE 1 IN (SELECT 1 FROM t2 WHERE t2.b < 3); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 33.33 Using where; FirstMatch 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join (`test`.`t2`) where (`test`.`t2`.`b` < 3) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 5 # Status of testing query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 5 Handler_update 3 DROP TABLE t1, t2; #7 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (1), (2), (3); # # query: UPDATE t1 SET a = 10 WHERE a IN (SELECT b FROM t2 WHERE t1.a < 3) # select: SELECT * FROM t1 WHERE a IN (SELECT b FROM t2 WHERE t1.a < 3) # EXPLAIN UPDATE t1 SET a = 10 WHERE a IN (SELECT b FROM t2 WHERE t1.a < 3); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 3 33.33 Using where Warnings: Note 1276 Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1 FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 SET a = 10 WHERE a IN (SELECT b FROM t2 WHERE t1.a < 3); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 3 33.33 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1276 Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1 # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a IN (SELECT b FROM t2 WHERE t1.a < 3); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 33.33 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 33.33 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1276 Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`b` = `test`.`t1`.`a`) and (`test`.`t1`.`a` < 3)) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 8 # Status of testing query execution: Variable_name Value Handler_read_first 4 Handler_read_key 4 Handler_read_rnd_next 11 Handler_update 2 DROP TABLE t1, t2; #7 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (1), (2), (3); # # query: UPDATE t1, t2 SET a = 10 WHERE a IN (SELECT b FROM t2 WHERE t2.b < 3) # select: SELECT * FROM t1, t2 WHERE a IN (SELECT b FROM t2 WHERE t2.b < 3) # EXPLAIN UPDATE t1, t2 SET a = 10 WHERE a IN (SELECT b FROM t2 WHERE t2.b < 3); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 33.33 Using where; FirstMatch(t1) 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1, t2 SET a = 10 WHERE a IN (SELECT b FROM t2 WHERE t2.b < 3); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 33.33 Using where; FirstMatch(t1) 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1, t2 WHERE a IN (SELECT b FROM t2 WHERE t2.b < 3); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 33.33 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t1` semi join (`test`.`t2`) join `test`.`t2` where ((`test`.`t2`.`b` = `test`.`t1`.`a`) and (`test`.`t1`.`a` < 3)) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 3 Handler_read_key 3 Handler_read_rnd_next 12 # Status of testing query execution: Variable_name Value Handler_read_first 5 Handler_read_key 5 Handler_read_rnd_next 15 Handler_update 2 DROP TABLE t1, t2; #8 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (1), (2), (3); # # query: UPDATE t1 t11, (SELECT * FROM t2) t12 SET t11.a = t11.a + 10 # select: SELECT * FROM t1 t11, (SELECT * FROM t2) t12 # EXPLAIN UPDATE t1 t11, (SELECT * FROM t2) t12 SET t11.a = t11.a + 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t11 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 t11, (SELECT * FROM t2) t12 SET t11.a = t11.a + 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t11 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 t11, (SELECT * FROM t2) t12; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t11 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t11`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t1` `t11` join `test`.`t2` # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 8 # Status of testing query execution: Variable_name Value Handler_read_first 4 Handler_read_key 4 Handler_read_rnd_next 16 Handler_update 3 DROP TABLE t1, t2; #9 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (1), (2), (3); # # query: UPDATE t1 t11, (SELECT 1 FROM DUAL) t12 SET t11.a = t11.a + 10 # select: SELECT * FROM t1 t11, (SELECT 1 FROM DUAL) t12 # EXPLAIN UPDATE t1 t11, (SELECT 1 FROM DUAL) t12 SET t11.a = t11.a + 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> NULL system NULL NULL NULL NULL 1 100.00 NULL 1 UPDATE t11 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL NULL No tables used FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 t11, (SELECT 1 FROM DUAL) t12 SET t11.a = t11.a + 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> NULL system NULL NULL NULL NULL 1 100.00 NULL 1 UPDATE t11 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value Handler_read_first 1 Handler_read_rnd_next 1 Handler_write 1 FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 t11, (SELECT 1 FROM DUAL) t12; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> NULL system NULL NULL NULL NULL 1 100.00 NULL 1 PRIMARY t11 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t11`.`a` AS `a`,'1' AS `1` from `test`.`t1` `t11` # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value Handler_read_first 1 Handler_read_rnd_next 1 Handler_write 1 # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 1 Handler_read_rnd_next 5 Handler_write 1 # Status of testing query execution: Variable_name Value Handler_read_first 2 Handler_read_key 4 Handler_read_rnd 3 Handler_read_rnd_next 9 Handler_update 3 Handler_write 4 DROP TABLE t1, t2; #10 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (1), (2), (3); # # query: UPDATE t1 t11, (SELECT * FROM t2) t12 SET t11.a = 10 WHERE t11.a > 1 # select: SELECT * FROM t1 t11, (SELECT * FROM t2) t12 WHERE t11.a > 1 # EXPLAIN UPDATE t1 t11, (SELECT * FROM t2) t12 SET t11.a = 10 WHERE t11.a > 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t11 NULL ALL NULL NULL NULL NULL 3 33.33 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 t11, (SELECT * FROM t2) t12 SET t11.a = 10 WHERE t11.a > 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t11 NULL ALL NULL NULL NULL NULL 3 33.33 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 t11, (SELECT * FROM t2) t12 WHERE t11.a > 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t11 NULL ALL NULL NULL NULL NULL 3 33.33 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t11`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t1` `t11` join `test`.`t2` where (`test`.`t11`.`a` > 1) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 8 # Status of testing query execution: Variable_name Value Handler_read_first 3 Handler_read_key 3 Handler_read_rnd_next 12 Handler_update 2 DROP TABLE t1, t2; #11 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); # # query: DELETE FROM t1 WHERE a > 1 LIMIT 1 # select: SELECT * FROM t1 WHERE a > 1 LIMIT 1 # EXPLAIN DELETE FROM t1 WHERE a > 1 LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 WHERE a > 1 LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a > 1 LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 33.33 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` > 1) limit 1 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 2 # Status of testing query execution: Variable_name Value Handler_delete 1 Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 2 DROP TABLE t1; #12 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); # # query: DELETE FROM t1 WHERE 0 # select: SELECT * FROM t1 WHERE 0 # EXPLAIN DELETE FROM t1 WHERE 0; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 WHERE 0; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE 0; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where 0 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value # Status of testing query execution: Variable_name Value DROP TABLE t1; #13 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); # # query: DELETE FROM t1 USING t1 WHERE 0 # select: SELECT * FROM t1 WHERE 0 # EXPLAIN DELETE FROM t1 USING t1 WHERE 0; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 USING t1 WHERE 0; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE 0; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where 0 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value # Status of testing query execution: Variable_name Value DROP TABLE t1; #14 CREATE TABLE t1 (a INT, b INT, UNIQUE KEY (a), KEY (b)); INSERT INTO t1 VALUES (3, 3), (7, 7); # # query: DELETE FROM t1 WHERE a = 3 # select: SELECT * FROM t1 WHERE a = 3 # EXPLAIN DELETE FROM t1 WHERE a = 3; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range a a 5 const 1 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 WHERE a = 3; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range a a 5 const 1 100.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a = 3; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL const a a 5 const 1 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select '3' AS `a`,'3' AS `b` from `test`.`t1` where 1 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value Handler_read_key 1 # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 1 # Status of testing query execution: Variable_name Value Handler_delete 1 Handler_read_key 1 DROP TABLE t1; #15 CREATE TABLE t1 (a INT, b INT, UNIQUE KEY (a), KEY (b)); INSERT INTO t1 VALUES (3, 3), (7, 7); # # query: DELETE FROM t1 WHERE a < 3 # select: SELECT * FROM t1 WHERE a < 3 # EXPLAIN DELETE FROM t1 WHERE a < 3; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range a a 5 const 1 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 WHERE a < 3; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range a a 5 const 1 100.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a < 3; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL range a a 5 NULL 1 100.00 Using index condition; Using MRR Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where (`test`.`t1`.`a` < 3) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 1 # Status of testing query execution: Variable_name Value Handler_read_key 1 DROP TABLE t1; #16 CREATE TABLE t1 ( a int PRIMARY KEY ); # # query: DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a # select: SELECT * FROM t1 WHERE t1.a > 0 ORDER BY t1.a # EXPLAIN DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range PRIMARY PRIMARY 4 const 1 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range PRIMARY PRIMARY 4 const 1 100.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE t1.a > 0 ORDER BY t1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL index PRIMARY PRIMARY 4 NULL 1 100.00 Using where; Using index Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` > 0) order by `test`.`t1`.`a` # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 # Status of testing query execution: Variable_name Value Handler_read_key 1 INSERT INTO t1 VALUES (1), (2), (3); # # query: DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a # select: SELECT * FROM t1 WHERE t1.a > 0 ORDER BY t1.a # EXPLAIN DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range PRIMARY PRIMARY 4 const 3 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 WHERE t1.a > 0 ORDER BY t1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range PRIMARY PRIMARY 4 const 3 100.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE t1.a > 0 ORDER BY t1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL index PRIMARY PRIMARY 4 NULL 3 100.00 Using where; Using index Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` > 0) order by `test`.`t1`.`a` # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_next 3 # Status of testing query execution: Variable_name Value Handler_delete 3 Handler_read_key 1 Handler_read_next 3 DROP TABLE t1; #17 CREATE TABLE t1(a INT PRIMARY KEY); INSERT INTO t1 VALUES (4),(3),(1),(2); # # query: DELETE FROM t1 WHERE (@a:= a) ORDER BY a LIMIT 1 # select: SELECT * FROM t1 WHERE (@a:= a) ORDER BY a LIMIT 1 # EXPLAIN DELETE FROM t1 WHERE (@a:= a) ORDER BY a LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL index NULL PRIMARY 4 NULL 4 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 WHERE (@a:= a) ORDER BY a LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL index NULL PRIMARY 4 NULL 4 100.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE (@a:= a) ORDER BY a LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL index NULL PRIMARY 4 NULL 1 100.00 Using where; Using index Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where (@a:=`test`.`t1`.`a`) order by `test`.`t1`.`a` limit 1 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 # Status of testing query execution: Variable_name Value Handler_delete 1 Handler_read_first 1 Handler_read_key 1 DROP TABLE t1; #18 CREATE TABLE t1 (a DATE, b TIME, c INT, KEY c(c), KEY b(b), KEY a(a)); INSERT INTO t1 VALUES (), (), (), (), (), (), (), (), (), (); UPDATE t1 SET a = c, b = c; # # query: DELETE FROM t1 ORDER BY a ASC, b ASC LIMIT 1 # select: SELECT * FROM t1 ORDER BY a ASC, b ASC LIMIT 1 # EXPLAIN DELETE FROM t1 ORDER BY a ASC, b ASC LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 10 100.00 Using filesort FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 ORDER BY a ASC, b ASC LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 10 100.00 Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 ORDER BY a ASC, b ASC LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 10 100.00 Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t1`.`c` AS `c` from `test`.`t1` order by `test`.`t1`.`a`,`test`.`t1`.`b` limit 1 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 11 Sort_rows 1 Sort_scan 1 # Status of testing query execution: Variable_name Value Handler_delete 1 Handler_read_first 1 Handler_read_key 2 Handler_read_rnd 1 Handler_read_rnd_next 11 Sort_rows 10 Sort_scan 1 DROP TABLE t1; #19 CREATE TABLE t1 (a1 INT NOT NULL, b1 INT NOT NULL); CREATE TABLE t2 (a2 INT NOT NULL, b2 INT NOT NULL, PRIMARY KEY (a2,b2)); CREATE TABLE t3 (a3 INT NOT NULL, b3 INT NOT NULL, PRIMARY KEY (a3,b3)); INSERT INTO t1 VALUES (1,1), (2,1), (1,3); INSERT INTO t2 VALUES (1,1), (2,2), (3,3); INSERT INTO t3 VALUES (1,1), (2,1), (1,3); # # query: DELETE t1,t2,t3 FROM t1,t2,t3 WHERE a1=a2 AND b2=a3 AND b1=b3 # select: SELECT * FROM t1,t2,t3 WHERE a1=a2 AND b2=a3 AND b1=b3 # EXPLAIN DELETE t1,t2,t3 FROM t1,t2,t3 WHERE a1=a2 AND b2=a3 AND b1=b3; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 DELETE t2 NULL ref PRIMARY PRIMARY 4 test.t1.a1 1 100.00 NULL 1 DELETE t3 NULL eq_ref PRIMARY PRIMARY 8 test.t2.b2,test.t1.b1 1 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE t1,t2,t3 FROM t1,t2,t3 WHERE a1=a2 AND b2=a3 AND b1=b3; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 DELETE t2 NULL ref PRIMARY PRIMARY 4 test.t1.a1 1 100.00 NULL 1 DELETE t3 NULL eq_ref PRIMARY PRIMARY 8 test.t2.b2,test.t1.b1 1 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1,t2,t3 WHERE a1=a2 AND b2=a3 AND b1=b3; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ref PRIMARY PRIMARY 4 test.t1.a1 1 100.00 Using index 1 SIMPLE t3 NULL eq_ref PRIMARY PRIMARY 8 test.t2.b2,test.t1.b1 1 100.00 Using index Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1`,`test`.`t1`.`b1` AS `b1`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`b2` AS `b2`,`test`.`t3`.`a3` AS `a3`,`test`.`t3`.`b3` AS `b3` from `test`.`t1` join `test`.`t2` join `test`.`t3` where ((`test`.`t3`.`b3` = `test`.`t1`.`b1`) and (`test`.`t3`.`a3` = `test`.`t2`.`b2`) and (`test`.`t2`.`a2` = `test`.`t1`.`a1`)) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 7 Handler_read_next 3 Handler_read_rnd_next 4 # Status of testing query execution: Variable_name Value Handler_delete 8 Handler_read_first 1 Handler_read_key 12 Handler_read_next 3 Handler_read_rnd 5 Handler_read_rnd_next 4 DROP TABLE t1, t2, t3; #20 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (a INT); INSERT INTO t2 VALUES (1), (2), (3); # # query: UPDATE t1 SET a = 10 WHERE a IN (SELECT a FROM t2) # select: SELECT * FROM t1 WHERE a IN (SELECT a FROM t2) # EXPLAIN UPDATE t1 SET a = 10 WHERE a IN (SELECT a FROM t2); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 3 33.33 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 SET a = 10 WHERE a IN (SELECT a FROM t2); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 3 33.33 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a IN (SELECT a FROM t2); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 3 33.33 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join (`test`.`t2`) where (`test`.`t2`.`a` = `test`.`t1`.`a`) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 8 # Status of testing query execution: Variable_name Value Handler_read_first 4 Handler_read_key 4 Handler_read_rnd_next 10 Handler_update 3 DROP TABLE t1, t2; #21 CREATE TABLE t1 (a1 INT); INSERT INTO t1 VALUES (1), (2), (3), (4), (5); CREATE TABLE t2 (a2 VARCHAR(10)); INSERT INTO t2 VALUES (1), (2), (3), (4), (5); SET @save_optimizer_switch= @@optimizer_switch; # # query: DELETE FROM t1 WHERE a1 IN (SELECT a2 FROM t2 WHERE a2 > 2) # select: SELECT * FROM t1 WHERE a1 IN (SELECT a2 FROM t2 WHERE a2 > 2) # EXPLAIN DELETE FROM t1 WHERE a1 IN (SELECT a2 FROM t2 WHERE a2 > 2); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 5 100.00 Using where 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 5 20.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 WHERE a1 IN (SELECT a2 FROM t2 WHERE a2 > 2); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 5 100.00 Using where 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 5 20.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a1 IN (SELECT a2 FROM t2 WHERE a2 > 2); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 5 100.00 Using where 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 5 20.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a1`,<exists>(/* select#2 */ select 1 from `test`.`t2` where ((`test`.`t2`.`a2` > 2) and (<cache>(`test`.`t1`.`a1`) = `test`.`t2`.`a2`)))) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 6 Handler_read_key 6 Handler_read_rnd_next 30 # Status of testing query execution: Variable_name Value Handler_delete 3 Handler_read_first 6 Handler_read_key 6 Handler_read_rnd_next 30 SET @@optimizer_switch= @save_optimizer_switch; TRUNCATE t1; INSERT INTO t1 VALUES (1), (2), (3), (4), (5); # # query: DELETE FROM t1 WHERE a1 IN (SELECT a2 FROM t2 WHERE a2 > 2) # select: SELECT * FROM t1 WHERE a1 IN (SELECT a2 FROM t2 WHERE a2 > 2) # EXPLAIN DELETE FROM t1 WHERE a1 IN (SELECT a2 FROM t2 WHERE a2 > 2); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 5 100.00 Using where 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 5 20.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 WHERE a1 IN (SELECT a2 FROM t2 WHERE a2 > 2); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 5 100.00 Using where 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 5 20.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a1 IN (SELECT a2 FROM t2 WHERE a2 > 2); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 5 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 5 20.00 Using where; FirstMatch(t1); Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a1` AS `a1` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`a2` > 2) and (`test`.`t1`.`a1` = `test`.`t2`.`a2`)) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 12 # Status of testing query execution: Variable_name Value Handler_delete 3 Handler_read_first 6 Handler_read_key 6 Handler_read_rnd_next 30 DROP TABLE t1, t2; #22 CREATE TABLE t1 (i INT, j INT); INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3), (4, 4), (5, 5); # # query: UPDATE t1 SET i = 10 # select: SELECT * FROM t1 # EXPLAIN UPDATE t1 SET i = 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 5 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 SET i = 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 5 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 5 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i`,`test`.`t1`.`j` AS `j` from `test`.`t1` # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 6 # Status of testing query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 6 Handler_update 5 DROP TABLE t1; #23 CREATE TABLE t1 (i INT, j INT); INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3), (4, 4), (5, 5); # # query: DELETE FROM t1 # select: SELECT * FROM t1 # EXPLAIN DELETE FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 5 100.00 Deleting all rows FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 5 100.00 Deleting all rows Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 5 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i`,`test`.`t1`.`j` AS `j` from `test`.`t1` # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 6 # Status of testing query execution: Variable_name Value Handler_delete 5 Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 6 DROP TABLE t1; #24 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2(a INT, b INT, c INT, d INT, INDEX(a, b, c)); INSERT INTO t2 (a, b, c) SELECT i, i, i FROM t1; INSERT INTO t2 (a, b, c) SELECT t1.i, t1.i, t1.i FROM t1, t1 x1, t1 x2; # # query: DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # select: SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # EXPLAIN DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL index NULL a 15 NULL X 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL index NULL a 15 NULL X X Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL index NULL a 15 NULL X X Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`b` = 10) order by `test`.`t2`.`a`,`test`.`t2`.`c` limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_next 4 # Status of testing query execution: Variable_name Value Handler_delete 5 Handler_read_first 1 Handler_read_key 1 Handler_read_next 4 DROP TABLE t1, t2; #25 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (i INT); # # query: INSERT INTO t2 SELECT * FROM t1 # select: SELECT * FROM t1 # EXPLAIN INSERT INTO t2 SELECT * FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t2 NULL ALL NULL NULL NULL NULL NULL NULL NULL 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED INSERT INTO t2 SELECT * FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t2 NULL ALL NULL NULL NULL NULL NULL NULL NULL 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 4 # Status of testing query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 4 Handler_write 3 # # query: INSERT INTO t2 SELECT * FROM t1 JOIN t1 AS tt USING(i) # select: SELECT * FROM t1 JOIN t1 AS tt USING(i) # EXPLAIN INSERT INTO t2 SELECT * FROM t1 JOIN t1 AS tt USING(i); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t2 NULL ALL NULL NULL NULL NULL NULL NULL NULL 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE tt NULL ALL NULL NULL NULL NULL 3 33.33 Using where; Using join buffer (Block Nested Loop) FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED INSERT INTO t2 SELECT * FROM t1 JOIN t1 AS tt USING(i); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t2 NULL ALL NULL NULL NULL NULL NULL NULL NULL 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE tt NULL ALL NULL NULL NULL NULL 3 33.33 Using where; Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 JOIN t1 AS tt USING(i); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 1 SIMPLE tt NULL ALL NULL NULL NULL NULL 3 33.33 Using where; Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` join `test`.`t1` `tt` where (`test`.`tt`.`i` = `test`.`t1`.`i`) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 8 # Status of testing query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 8 Handler_write 3 DROP TABLE t1, t2; #26 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (i INT); # # query: REPLACE INTO t2 SELECT * FROM t1 # select: SELECT * FROM t1 # EXPLAIN REPLACE INTO t2 SELECT * FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 REPLACE t2 NULL ALL NULL NULL NULL NULL NULL NULL NULL 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED REPLACE INTO t2 SELECT * FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 REPLACE t2 NULL ALL NULL NULL NULL NULL NULL NULL NULL 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 3 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 4 # Status of testing query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 4 Handler_write 3 DROP TABLE t1, t2; #27 CREATE TABLE t1 (i INT); # # query: INSERT INTO t1 SET i = 10 # select: # EXPLAIN INSERT INTO t1 SET i = 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t1 NULL ALL NULL NULL NULL NULL NULL NULL NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED INSERT INTO t1 SET i = 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t1 NULL ALL NULL NULL NULL NULL NULL NULL NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value # Status of testing query execution: Variable_name Value Handler_write 1 DROP TABLE t1; #28 CREATE TABLE t1 (i INT); # # query: REPLACE INTO t1 SET i = 10 # select: # EXPLAIN REPLACE INTO t1 SET i = 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 REPLACE t1 NULL ALL NULL NULL NULL NULL NULL NULL NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED REPLACE INTO t1 SET i = 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 REPLACE t1 NULL ALL NULL NULL NULL NULL NULL NULL NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value # Status of testing query execution: Variable_name Value Handler_write 1 DROP TABLE t1; #29 CREATE TABLE t1 (a INT, i INT PRIMARY KEY); INSERT INTO t1 (i) VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); # # query: DELETE FROM t1 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 1 # select: SELECT * FROM t1 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 1 # EXPLAIN DELETE FROM t1 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range PRIMARY PRIMARY 4 const X 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range PRIMARY PRIMARY 4 const X X Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL range PRIMARY PRIMARY 4 NULL X X Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`i` AS `i` from `test`.`t1` where ((`test`.`t1`.`i` > 10) and (`test`.`t1`.`i` <= 18)) order by `test`.`t1`.`i` limit 1 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 1 # Status of testing query execution: Variable_name Value Handler_delete 1 Handler_read_key 1 DROP TABLE t1; #30 CREATE TABLE t1(a INT, i CHAR(2), INDEX(i(1))); INSERT INTO t1 (i) VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); # # query: DELETE FROM t1 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 5 # select: SELECT * FROM t1 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 5 # EXPLAIN DELETE FROM t1 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1739 Cannot use range access on index 'i' due to type or collation conversion on field 'i' Warning 1739 Cannot use range access on index 'i' due to type or collation conversion on field 'i' FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Warning 1739 Cannot use range access on index 'i' due to type or collation conversion on field 'i' Warning 1739 Cannot use range access on index 'i' due to type or collation conversion on field 'i' # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL i NULL NULL NULL 26 11.11 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Warning 1739 Cannot use range access on index 'i' due to type or collation conversion on field 'i' Warning 1739 Cannot use range access on index 'i' due to type or collation conversion on field 'i' Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`i` AS `i` from `test`.`t1` where ((`test`.`t1`.`i` > 10) and (`test`.`t1`.`i` <= 18)) order by `test`.`t1`.`i` limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 27 Sort_rows 5 Sort_scan 1 # Status of testing query execution: Variable_name Value Handler_delete 5 Handler_read_first 1 Handler_read_key 6 Handler_read_rnd 5 Handler_read_rnd_next 27 Sort_rows 8 Sort_scan 1 DROP TABLE t1; #31 CREATE TABLE t1 (i INT); INSERT INTO t1 (i) VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2(a INT, b INT, c INT, d INT, INDEX(a, b, c)); INSERT INTO t2 (a, b, c) SELECT i, i, i FROM t1; # # query: DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # select: SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # EXPLAIN DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL index NULL a 15 NULL 5 10.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`b` = 10) order by `test`.`t2`.`a`,`test`.`t2`.`c` limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_next 26 # Status of testing query execution: Variable_name Value Handler_delete 1 Handler_read_first 1 Handler_read_key 2 Handler_read_rnd 1 Handler_read_rnd_next 27 Sort_rows 1 Sort_scan 1 DROP TABLE t1, t2; #32 CREATE TABLE t1 (i INT); INSERT INTO t1 (i) VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2(a INT, b INT, c INT, d INT, INDEX(a, b, c)); INSERT INTO t2 (a, b, c) SELECT i, i, i FROM t1; INSERT INTO t2 (a, b, c) SELECT t1.i, t1.i, t1.i FROM t1, t1 x1, t1 x2; # # query: DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # select: SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # EXPLAIN DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL index NULL a 15 NULL X 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL index NULL a 15 NULL X X Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL index NULL a 15 NULL X X Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`b` = 10) order by `test`.`t2`.`a`,`test`.`t2`.`c` limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_next 4 # Status of testing query execution: Variable_name Value Handler_delete 5 Handler_read_first 1 Handler_read_key 1 Handler_read_next 4 DROP TABLE t1, t2; #33 CREATE TABLE t1 (i INT); INSERT INTO t1 (i) VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2 (a CHAR(2), b CHAR(2), c CHAR(2), d CHAR(2), INDEX (a,b(1),c)); INSERT INTO t2 SELECT i, i, i, i FROM t1; # # query: DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # select: SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # EXPLAIN DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b' FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b' # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 26 10.00 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`b` = 10) order by `test`.`t2`.`a`,`test`.`t2`.`c` limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 27 Sort_rows 1 Sort_scan 1 # Status of testing query execution: Variable_name Value Handler_delete 1 Handler_read_first 1 Handler_read_key 2 Handler_read_rnd 1 Handler_read_rnd_next 27 Sort_rows 1 Sort_scan 1 DROP TABLE t1, t2; #34 CREATE TABLE t1 (i INT); INSERT INTO t1 (i) VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2 (a CHAR(2), b CHAR(2), c CHAR(2), d CHAR(2), INDEX (a,b,c)) ENGINE=HEAP; INSERT INTO t2 SELECT i, i, i, i FROM t1; # # query: DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # select: SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # EXPLAIN DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b' FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b' # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 26 10.00 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`b` = 10) order by `test`.`t2`.`a`,`test`.`t2`.`c` limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_rnd 1 Handler_read_rnd_next 27 Sort_rows 1 Sort_scan 1 # Status of testing query execution: Variable_name Value Handler_delete 1 Handler_read_rnd 1 Handler_read_rnd_next 27 Sort_rows 1 Sort_scan 1 DROP TABLE t1, t2; #35 CREATE TABLE t1 (i INT); INSERT INTO t1 (i) VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35),(36),(37),(38),(39), (40),(41),(42),(43),(44); CREATE TABLE t2 (i INT, key1 INT, key2 INT, INDEX (key1), INDEX (key2)); INSERT INTO t2 (key1, key2) SELECT i, i FROM t1; # # query: DELETE FROM t2 WHERE key1 < 13 or key2 < 14 ORDER BY key1 # select: SELECT * FROM t2 WHERE key1 < 13 or key2 < 14 ORDER BY key1 # EXPLAIN DELETE FROM t2 WHERE key1 < 13 or key2 < 14 ORDER BY key1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL index_merge key1,key2 key1,key2 5,5 NULL X 100.00 Using sort_union(key1,key2); Using where; Using filesort FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t2 WHERE key1 < 13 or key2 < 14 ORDER BY key1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL index_merge key1,key2 key1,key2 5,5 NULL X X Using sort_union(key1,key2); Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE key1 < 13 or key2 < 14 ORDER BY key1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL index_merge key1,key2 key1,key2 5,5 NULL X X Using sort_union(key1,key2); Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`i` AS `i`,`test`.`t2`.`key1` AS `key1`,`test`.`t2`.`key2` AS `key2` from `test`.`t2` where ((`test`.`t2`.`key1` < 13) or (`test`.`t2`.`key2` < 14)) order by `test`.`t2`.`key1` # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 6 Handler_read_next 7 Handler_read_rnd 4 Sort_range 1 Sort_rows 4 # Status of testing query execution: Variable_name Value Handler_delete 4 Handler_read_key 10 Handler_read_next 7 Handler_read_rnd 8 Sort_range 1 Sort_rows 4 DROP TABLE t1, t2; #36 CREATE TABLE t1 (i INT); INSERT INTO t1 (i) VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2(a INT, i INT PRIMARY KEY); INSERT INTO t2 (i) SELECT i FROM t1; # # query: DELETE FROM t2 WHERE i > 10 AND i <= 18 ORDER BY i DESC LIMIT 1 # select: SELECT * FROM t2 WHERE i > 10 AND i <= 18 ORDER BY i DESC LIMIT 1 # EXPLAIN DELETE FROM t2 WHERE i > 10 AND i <= 18 ORDER BY i DESC LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL range PRIMARY PRIMARY 4 const X 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t2 WHERE i > 10 AND i <= 18 ORDER BY i DESC LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL range PRIMARY PRIMARY 4 const X X Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE i > 10 AND i <= 18 ORDER BY i DESC LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL range PRIMARY PRIMARY 4 NULL X X Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`i` AS `i` from `test`.`t2` where ((`test`.`t2`.`i` > 10) and (`test`.`t2`.`i` <= 18)) order by `test`.`t2`.`i` desc limit 1 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 1 # Status of testing query execution: Variable_name Value Handler_delete 1 Handler_read_key 1 DROP TABLE t1, t2; #37 CREATE TABLE t1 (i INT); INSERT INTO t1 (i) VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2 (a CHAR(2), b CHAR(2), c CHAR(2), INDEX (a, b)); INSERT INTO t2 SELECT i, i, i FROM t1; # # query: DELETE FROM t2 ORDER BY a, b DESC LIMIT 5 # select: SELECT * FROM t2 ORDER BY a, b DESC LIMIT 5 # EXPLAIN DELETE FROM t2 ORDER BY a, b DESC LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using filesort FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t2 ORDER BY a, b DESC LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 ORDER BY a, b DESC LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t2` order by `test`.`t2`.`a`,`test`.`t2`.`b` desc limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 27 Sort_rows 5 Sort_scan 1 # Status of testing query execution: Variable_name Value Handler_delete 5 Handler_read_first 1 Handler_read_key 6 Handler_read_rnd 5 Handler_read_rnd_next 27 Sort_rows 26 Sort_scan 1 DROP TABLE t1, t2; #38 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2 (a CHAR(2), b CHAR(2), c INT, INDEX (a, b)); INSERT INTO t2 (a, b) SELECT i, i FROM t1; INSERT INTO t2 (a, b) SELECT t1.i, t1.i FROM t1, t1 x1, t1 x2; # # query: DELETE FROM t2 ORDER BY a DESC, b DESC LIMIT 5 # select: SELECT * FROM t2 ORDER BY a DESC, b DESC LIMIT 5 # EXPLAIN DELETE FROM t2 ORDER BY a DESC, b DESC LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL index NULL a 6 NULL X 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t2 ORDER BY a DESC, b DESC LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t2 NULL index NULL a 6 NULL X X NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 ORDER BY a DESC, b DESC LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL index NULL a 6 NULL X X NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t2` order by `test`.`t2`.`a` desc,`test`.`t2`.`b` desc limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 1 Handler_read_last 1 Handler_read_prev 4 # Status of testing query execution: Variable_name Value Handler_delete 5 Handler_read_key 1 Handler_read_last 1 Handler_read_prev 4 DROP TABLE t1, t2; #39 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2(a INT, i INT PRIMARY KEY); INSERT INTO t2 (i) SELECT i FROM t1; # # query: UPDATE t2 SET a = 10 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 1 # select: SELECT * FROM t2 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 1 # EXPLAIN UPDATE t2 SET a = 10 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL range PRIMARY PRIMARY 4 const X 100.00 Using where; Using temporary FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t2 SET a = 10 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL range PRIMARY PRIMARY 4 const X X Using where; Using temporary Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL range PRIMARY PRIMARY 4 NULL X X Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`i` AS `i` from `test`.`t2` where ((`test`.`t2`.`i` > 10) and (`test`.`t2`.`i` <= 18)) order by `test`.`t2`.`i` limit 1 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 1 # Status of testing query execution: Variable_name Value Handler_read_key 2 Handler_read_rnd 1 Handler_update 1 DROP TABLE t1, t2; #40 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2(a INT, i CHAR(2), INDEX(i(1))); INSERT INTO t2 (i) SELECT i FROM t1; # # query: UPDATE t2 SET a = 10 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 5 # select: SELECT * FROM t2 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 5 # EXPLAIN UPDATE t2 SET a = 10 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1739 Cannot use range access on index 'i' due to type or collation conversion on field 'i' Warning 1739 Cannot use range access on index 'i' due to type or collation conversion on field 'i' FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t2 SET a = 10 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Warning 1739 Cannot use range access on index 'i' due to type or collation conversion on field 'i' Warning 1739 Cannot use range access on index 'i' due to type or collation conversion on field 'i' # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE i > 10 AND i <= 18 ORDER BY i LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL i NULL NULL NULL 26 11.11 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Warning 1739 Cannot use range access on index 'i' due to type or collation conversion on field 'i' Warning 1739 Cannot use range access on index 'i' due to type or collation conversion on field 'i' Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`i` AS `i` from `test`.`t2` where ((`test`.`t2`.`i` > 10) and (`test`.`t2`.`i` <= 18)) order by `test`.`t2`.`i` limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 27 Sort_rows 5 Sort_scan 1 # Status of testing query execution: Variable_name Value Handler_read_first 1 Handler_read_key 6 Handler_read_rnd 5 Handler_read_rnd_next 27 Handler_update 5 Sort_rows 5 Sort_scan 1 DROP TABLE t1, t2; #41 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2(a INT, b INT, c INT, d INT, INDEX(a, b, c)); INSERT INTO t2 (a, b, c) SELECT i, i, i FROM t1; # # query: UPDATE t2 SET d = 10 WHERE b = 10 ORDER BY a, c LIMIT 5 # select: SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # EXPLAIN UPDATE t2 SET d = 10 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t2 SET d = 10 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL index NULL a 15 NULL 5 10.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`b` = 10) order by `test`.`t2`.`a`,`test`.`t2`.`c` limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_next 26 # Status of testing query execution: Variable_name Value Handler_read_first 1 Handler_read_key 2 Handler_read_rnd 1 Handler_read_rnd_next 27 Handler_update 1 Sort_rows 1 Sort_scan 1 DROP TABLE t1, t2; #42 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2(a INT, b INT, c INT, d INT, INDEX(a, b, c)); INSERT INTO t2 (a, b, c) SELECT i, i, i FROM t1; INSERT INTO t2 (a, b, c) SELECT t1.i, t1.i, t1.i FROM t1, t1 x1, t1 x2; # # query: UPDATE t2 SET d = 10 WHERE b = 10 ORDER BY a, c LIMIT 5 # select: SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # EXPLAIN UPDATE t2 SET d = 10 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL index NULL a 15 NULL X 100.00 Using where; Using temporary FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t2 SET d = 10 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL index NULL a 15 NULL X X Using where; Using temporary Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL index NULL a 15 NULL X X Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`b` = 10) order by `test`.`t2`.`a`,`test`.`t2`.`c` limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_next 4 # Status of testing query execution: Variable_name Value Handler_read_first 1 Handler_read_key 6 Handler_read_next 4 Handler_read_rnd 5 Handler_update 5 DROP TABLE t1, t2; #43 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2 (a CHAR(2), b CHAR(2), c CHAR(2), d CHAR(2), INDEX (a,b(1),c)); INSERT INTO t2 SELECT i, i, i, i FROM t1; # # query: UPDATE t2 SET d = 10 WHERE b = 10 ORDER BY a, c LIMIT 5 # select: SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # EXPLAIN UPDATE t2 SET d = 10 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b' FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t2 SET d = 10 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b' # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 26 10.00 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`b` = 10) order by `test`.`t2`.`a`,`test`.`t2`.`c` limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 27 Sort_rows 1 Sort_scan 1 # Status of testing query execution: Variable_name Value Handler_read_first 1 Handler_read_key 2 Handler_read_rnd 1 Handler_read_rnd_next 27 Handler_update 1 Sort_rows 1 Sort_scan 1 DROP TABLE t1, t2; #44 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2 (a CHAR(2), b CHAR(2), c CHAR(2), d CHAR(2), INDEX (a,b,c)) ENGINE=HEAP; INSERT INTO t2 SELECT i, i, i, i FROM t1; # # query: UPDATE t2 SET d = 10 WHERE b = 10 ORDER BY a, c LIMIT 5 # select: SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5 # EXPLAIN UPDATE t2 SET d = 10 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b' FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t2 SET d = 10 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Warning 1739 Cannot use range access on index 'a' due to type or collation conversion on field 'b' # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE b = 10 ORDER BY a, c LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 26 10.00 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c`,`test`.`t2`.`d` AS `d` from `test`.`t2` where (`test`.`t2`.`b` = 10) order by `test`.`t2`.`a`,`test`.`t2`.`c` limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_rnd 1 Handler_read_rnd_next 27 Sort_rows 1 Sort_scan 1 # Status of testing query execution: Variable_name Value Handler_read_rnd 1 Handler_read_rnd_next 27 Sort_rows 1 Sort_scan 1 DROP TABLE t1, t2; #45 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35),(36),(37),(38),(39), (40),(41),(42),(43),(44); CREATE TABLE t2 (i INT, key1 INT, key2 INT, INDEX (key1), INDEX (key2)); INSERT INTO t2 (key1, key2) SELECT i, i FROM t1; # # query: UPDATE t2 SET i = 123 WHERE key1 < 13 or key2 < 14 ORDER BY key1 # select: SELECT * FROM t2 WHERE key1 < 13 or key2 < 14 ORDER BY key1 # EXPLAIN UPDATE t2 SET i = 123 WHERE key1 < 13 or key2 < 14 ORDER BY key1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL index_merge key1,key2 key1,key2 5,5 NULL X 100.00 Using sort_union(key1,key2); Using where; Using filesort FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t2 SET i = 123 WHERE key1 < 13 or key2 < 14 ORDER BY key1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL index_merge key1,key2 key1,key2 5,5 NULL X X Using sort_union(key1,key2); Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE key1 < 13 or key2 < 14 ORDER BY key1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL index_merge key1,key2 key1,key2 5,5 NULL X X Using sort_union(key1,key2); Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`i` AS `i`,`test`.`t2`.`key1` AS `key1`,`test`.`t2`.`key2` AS `key2` from `test`.`t2` where ((`test`.`t2`.`key1` < 13) or (`test`.`t2`.`key2` < 14)) order by `test`.`t2`.`key1` # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 6 Handler_read_next 7 Handler_read_rnd 4 Sort_range 1 Sort_rows 4 # Status of testing query execution: Variable_name Value Handler_read_key 10 Handler_read_next 7 Handler_read_rnd 8 Handler_update 4 Sort_range 1 Sort_rows 4 DROP TABLE t1, t2; #46 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2(a INT, i INT PRIMARY KEY); INSERT INTO t2 (i) SELECT i FROM t1; # # query: UPDATE t2 SET a = 10 WHERE i > 10 AND i <= 18 ORDER BY i DESC LIMIT 1 # select: SELECT * FROM t2 WHERE i > 10 AND i <= 18 ORDER BY i DESC LIMIT 1 # EXPLAIN UPDATE t2 SET a = 10 WHERE i > 10 AND i <= 18 ORDER BY i DESC LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL range PRIMARY PRIMARY 4 const X 100.00 Using where; Using temporary FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t2 SET a = 10 WHERE i > 10 AND i <= 18 ORDER BY i DESC LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL range PRIMARY PRIMARY 4 const X X Using where; Using temporary Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 WHERE i > 10 AND i <= 18 ORDER BY i DESC LIMIT 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL range PRIMARY PRIMARY 4 NULL X X Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`i` AS `i` from `test`.`t2` where ((`test`.`t2`.`i` > 10) and (`test`.`t2`.`i` <= 18)) order by `test`.`t2`.`i` desc limit 1 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 1 # Status of testing query execution: Variable_name Value Handler_read_key 2 Handler_read_rnd 1 Handler_update 1 DROP TABLE t1, t2; #47 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2 (a CHAR(2), b CHAR(2), c CHAR(2), INDEX (a, b)); INSERT INTO t2 SELECT i, i, i FROM t1; # # query: UPDATE t2 SET c = 10 ORDER BY a, b DESC LIMIT 5 # select: SELECT * FROM t2 ORDER BY a, b DESC LIMIT 5 # EXPLAIN UPDATE t2 SET c = 10 ORDER BY a, b DESC LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using filesort FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t2 SET c = 10 ORDER BY a, b DESC LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 ORDER BY a, b DESC LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 26 100.00 Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t2` order by `test`.`t2`.`a`,`test`.`t2`.`b` desc limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 27 Sort_rows 5 Sort_scan 1 # Status of testing query execution: Variable_name Value Handler_read_first 1 Handler_read_key 6 Handler_read_rnd 5 Handler_read_rnd_next 27 Handler_update 5 Sort_rows 5 Sort_scan 1 DROP TABLE t1, t2; #48 CREATE TABLE t1 (i INT); INSERT INTO t1 VALUES (10),(11),(12),(13),(14),(15),(16),(17),(18),(19), (20),(21),(22),(23),(24),(25),(26),(27),(28),(29), (30),(31),(32),(33),(34),(35); CREATE TABLE t2 (a CHAR(2), b CHAR(2), c INT, INDEX (a, b)); INSERT INTO t2 (a, b) SELECT i, i FROM t1; INSERT INTO t2 (a, b) SELECT t1.i, t1.i FROM t1, t1 x1, t1 x2; # # query: UPDATE t2 SET c = 10 ORDER BY a DESC, b DESC LIMIT 5 # select: SELECT * FROM t2 ORDER BY a DESC, b DESC LIMIT 5 # EXPLAIN UPDATE t2 SET c = 10 ORDER BY a DESC, b DESC LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL index NULL a 6 NULL X 100.00 Using temporary FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t2 SET c = 10 ORDER BY a DESC, b DESC LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t2 NULL index NULL a 6 NULL X X Using temporary Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2 ORDER BY a DESC, b DESC LIMIT 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL index NULL a 6 NULL X X NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t2`.`c` AS `c` from `test`.`t2` order by `test`.`t2`.`a` desc,`test`.`t2`.`b` desc limit 5 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 1 Handler_read_last 1 Handler_read_prev 4 # Status of testing query execution: Variable_name Value Handler_read_key 6 Handler_read_last 1 Handler_read_prev 4 Handler_read_rnd 5 Handler_update 5 DROP TABLE t1, t2; #49 CREATE TABLE t1 ( pk INT NOT NULL AUTO_INCREMENT, c1_idx CHAR(1) DEFAULT 'y', c2 INT, PRIMARY KEY (pk), INDEX c1_idx (c1_idx) ); INSERT INTO t1 VALUES (1,'y',1), (2,'n',2), (3,'y',3), (4,'n',4); # # query: UPDATE t1 SET c2 = 0 WHERE c1_idx = 'y' ORDER BY pk DESC LIMIT 2 # select: SELECT * FROM t1 WHERE c1_idx = 'y' ORDER BY pk DESC LIMIT 2 # EXPLAIN UPDATE t1 SET c2 = 0 WHERE c1_idx = 'y' ORDER BY pk DESC LIMIT 2; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL range c1_idx c1_idx 2 const 2 100.00 Using where; Using temporary FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 SET c2 = 0 WHERE c1_idx = 'y' ORDER BY pk DESC LIMIT 2; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL range c1_idx c1_idx 2 const 2 100.00 Using where; Using temporary Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE c1_idx = 'y' ORDER BY pk DESC LIMIT 2; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ref c1_idx c1_idx 2 const 2 100.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`c1_idx` AS `c1_idx`,`test`.`t1`.`c2` AS `c2` from `test`.`t1` where (`test`.`t1`.`c1_idx` = 'y') order by `test`.`t1`.`pk` desc limit 2 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 1 Handler_read_prev 1 # Status of testing query execution: Variable_name Value Handler_read_key 3 Handler_read_prev 1 Handler_read_rnd 2 Handler_update 2 # # query: DELETE FROM t1 WHERE c1_idx = 'y' ORDER BY pk DESC LIMIT 2 # select: SELECT * FROM t1 WHERE c1_idx = 'y' ORDER BY pk DESC LIMIT 2 # EXPLAIN DELETE FROM t1 WHERE c1_idx = 'y' ORDER BY pk DESC LIMIT 2; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range c1_idx c1_idx 2 const 2 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM t1 WHERE c1_idx = 'y' ORDER BY pk DESC LIMIT 2; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range c1_idx c1_idx 2 const 2 100.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE c1_idx = 'y' ORDER BY pk DESC LIMIT 2; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ref c1_idx c1_idx 2 const 2 100.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`c1_idx` AS `c1_idx`,`test`.`t1`.`c2` AS `c2` from `test`.`t1` where (`test`.`t1`.`c1_idx` = 'y') order by `test`.`t1`.`pk` desc limit 2 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 1 Handler_read_prev 1 # Status of testing query execution: Variable_name Value Handler_delete 2 Handler_read_key 1 Handler_read_prev 1 DROP TABLE t1; #50 CREATE TABLE t1 (a INT AUTO_INCREMENT PRIMARY KEY); INSERT INTO t1 VALUES (),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(),(); # # query: UPDATE t1 SET a=a+10 WHERE a > 34 # select: SELECT * FROM t1 WHERE a > 34 # EXPLAIN UPDATE t1 SET a=a+10 WHERE a > 34; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL range PRIMARY PRIMARY 4 const 2 100.00 Using where; Using temporary FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 SET a=a+10 WHERE a > 34; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL range PRIMARY PRIMARY 4 const 2 100.00 Using where; Using temporary Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a > 34; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL range PRIMARY PRIMARY 4 NULL 2 100.00 Using where; Using index Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` > 34) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 1 Handler_read_next 2 # Status of testing query execution: Variable_name Value Handler_read_key 3 Handler_read_next 2 Handler_read_rnd 2 Handler_update 2 DROP TABLE t1; #51 CREATE TABLE t1 (c1 INT, c2 INT, c3 INT); CREATE TABLE t2 (c1 INT, c2 INT); INSERT INTO t1 VALUES (1, 1, 10), (2, 2, 20); # # query: UPDATE t1 LEFT JOIN t2 ON t1.c1 = t2.c1 SET t2.c2 = 10 # select: SELECT * FROM t1 LEFT JOIN t2 ON t1.c1 = t2.c1 # EXPLAIN UPDATE t1 LEFT JOIN t2 ON t1.c1 = t2.c1 SET t2.c2 = 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 1 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 LEFT JOIN t2 ON t1.c1 = t2.c1 SET t2.c2 = 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 1 100.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 LEFT JOIN t2 ON t1.c1 = t2.c1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 1 100.00 Using where; Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`c1` AS `c1`,`test`.`t1`.`c2` AS `c2`,`test`.`t1`.`c3` AS `c3`,`test`.`t2`.`c1` AS `c1`,`test`.`t2`.`c2` AS `c2` from `test`.`t1` left join `test`.`t2` on((`test`.`t2`.`c1` = `test`.`t1`.`c1`)) where 1 # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 4 # Status of testing query execution: Variable_name Value Handler_read_first 3 Handler_read_key 3 Handler_read_rnd_next 5 # # query: UPDATE t1 LEFT JOIN t2 ON t1.c1 = t2.c1 SET t2.c2 = 10 WHERE t1.c3 = 10 # select: SELECT * FROM t1 LEFT JOIN t2 ON t1.c1 = t2.c1 WHERE t1.c3 = 10 # EXPLAIN UPDATE t1 LEFT JOIN t2 ON t1.c1 = t2.c1 SET t2.c2 = 10 WHERE t1.c3 = 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 2 50.00 Using where 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 1 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 LEFT JOIN t2 ON t1.c1 = t2.c1 SET t2.c2 = 10 WHERE t1.c3 = 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 2 50.00 Using where 1 UPDATE t2 NULL ALL NULL NULL NULL NULL 1 100.00 Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 LEFT JOIN t2 ON t1.c1 = t2.c1 WHERE t1.c3 = 10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 2 50.00 Using where 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 1 100.00 Using where; Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`c1` AS `c1`,`test`.`t1`.`c2` AS `c2`,`test`.`t1`.`c3` AS `c3`,`test`.`t2`.`c1` AS `c1`,`test`.`t2`.`c2` AS `c2` from `test`.`t1` left join `test`.`t2` on((`test`.`t2`.`c1` = `test`.`t1`.`c1`)) where (`test`.`t1`.`c3` = 10) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 4 # Status of testing query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 4 DROP TABLE t1, t2; #52 CREATE TABLE t1(f1 INT, f2 INT); CREATE TABLE t2(f3 INT, f4 INT); CREATE INDEX IDX ON t2(f3); INSERT INTO t1 VALUES(1,0),(2,0); INSERT INTO t2 VALUES(1,1),(2,2); # # query: UPDATE t1 SET t1.f2=(SELECT MAX(t2.f4) FROM t2 WHERE t2.f3=t1.f1) # select: SELECT (SELECT MAX(t2.f4) FROM t2 WHERE t2.f3=t1.f1) FROM t1 # EXPLAIN UPDATE t1 SET t1.f2=(SELECT MAX(t2.f4) FROM t2 WHERE t2.f3=t1.f1); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 2 DEPENDENT SUBQUERY t2 NULL ref IDX IDX 5 test.t1.f1 1 100.00 NULL Warnings: Note 1276 Field or reference 'test.t1.f1' of SELECT #2 was resolved in SELECT #1 FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 SET t1.f2=(SELECT MAX(t2.f4) FROM t2 WHERE t2.f3=t1.f1); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 2 DEPENDENT SUBQUERY t2 NULL ref IDX IDX 5 test.t1.f1 1 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1276 Field or reference 'test.t1.f1' of SELECT #2 was resolved in SELECT #1 # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT (SELECT MAX(t2.f4) FROM t2 WHERE t2.f3=t1.f1) FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 2 DEPENDENT SUBQUERY t2 NULL ref IDX IDX 5 test.t1.f1 1 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1276 Field or reference 'test.t1.f1' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select (/* select#2 */ select max(`test`.`t2`.`f4`) from `test`.`t2` where (`test`.`t2`.`f3` = `test`.`t1`.`f1`)) AS `(SELECT MAX(t2.f4) FROM t2 WHERE t2.f3=t1.f1)` from `test`.`t1` # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 3 Handler_read_next 2 Handler_read_rnd_next 3 # Status of testing query execution: Variable_name Value Handler_read_first 1 Handler_read_key 3 Handler_read_next 2 Handler_read_rnd_next 3 Handler_update 2 DROP TABLE t1, t2; #55 CREATE TABLE t1(a INT); INSERT INTO t1 VALUES (1); SET @a = NULL; EXPLAIN DELETE FROM t1 WHERE (@a:= a); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 1 100.00 Using where DROP TABLE t1; #56 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); DELETE FROM t1 USING t1 WHERE uknown_column = 12345; ERROR 42S22: Unknown column 'uknown_column' in 'where clause' EXPLAIN EXTENDED DELETE FROM t1 USING t1 WHERE uknown_column = 12345; ERROR 42S22: Unknown column 'uknown_column' in 'where clause' DROP TABLE t1; #57 CREATE TABLE t1(f1 INT); EXPLAIN EXTENDED UPDATE t1 SET f2=1 ORDER BY f2; ERROR 42S22: Unknown column 'f2' in 'order clause' UPDATE t1 SET f2=1 ORDER BY f2; ERROR 42S22: Unknown column 'f2' in 'order clause' DROP TABLE t1; #59 CREATE TABLE t1 ( a INT, KEY( a ) ); INSERT INTO t1 VALUES (0), (1); CREATE VIEW v1 AS SELECT t11.a, t12.a AS b FROM t1 t11, t1 t12; SET SESSION sql_safe_updates = 1; EXPLAIN EXTENDED UPDATE IGNORE v1 SET a = 1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t11 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 1 SIMPLE t12 NULL index NULL a 5 NULL 2 100.00 Using index Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. UPDATE IGNORE v1 SET a = 1; ERROR HY000: You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column. SET SESSION sql_safe_updates = DEFAULT; DROP TABLE t1; DROP VIEW v1; #62 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (0), (1); CREATE VIEW v1 AS SELECT t11.a, t12.a AS b FROM t1 t11, t1 t12; # # query: UPDATE v1 SET a = 1 WHERE a > 0 # select: SELECT * FROM v1 WHERE a > 0 # EXPLAIN UPDATE v1 SET a = 1 WHERE a > 0; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t11 NULL ALL NULL NULL NULL NULL 2 50.00 Using where 1 SIMPLE t12 NULL ALL NULL NULL NULL NULL 2 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE v1 SET a = 1 WHERE a > 0; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t11 NULL ALL NULL NULL NULL NULL 2 50.00 Using where 1 SIMPLE t12 NULL ALL NULL NULL NULL NULL 2 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM v1 WHERE a > 0; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t11 NULL ALL NULL NULL NULL NULL 2 50.00 Using where 1 SIMPLE t12 NULL ALL NULL NULL NULL NULL 2 100.00 Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t11`.`a` AS `a`,`test`.`t12`.`a` AS `b` from `test`.`t1` `t11` join `test`.`t1` `t12` where (`test`.`t11`.`a` > 0) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 2 Handler_read_rnd_next 6 # Status of testing query execution: Variable_name Value Handler_read_first 2 Handler_read_key 3 Handler_read_rnd 1 Handler_read_rnd_next 9 Handler_write 2 # # query: UPDATE t1, v1 SET v1.a = 1 WHERE t1.a = v1.a # select: SELECT * FROM t1, v1 WHERE t1.a = v1.a # EXPLAIN UPDATE t1, v1 SET v1.a = 1 WHERE t1.a = v1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 1 UPDATE t11 NULL ALL NULL NULL NULL NULL 2 50.00 Using where 1 SIMPLE t12 NULL ALL NULL NULL NULL NULL 2 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1, v1 SET v1.a = 1 WHERE t1.a = v1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 1 UPDATE t11 NULL ALL NULL NULL NULL NULL 2 50.00 Using where 1 SIMPLE t12 NULL ALL NULL NULL NULL NULL 2 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1, v1 WHERE t1.a = v1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 1 SIMPLE t11 NULL ALL NULL NULL NULL NULL 2 50.00 Using where; Using join buffer (Block Nested Loop) 1 SIMPLE t12 NULL ALL NULL NULL NULL NULL 2 100.00 Using join buffer (Block Nested Loop) Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t11`.`a` AS `a`,`test`.`t12`.`a` AS `b` from `test`.`t1` join `test`.`t1` `t11` join `test`.`t1` `t12` where (`test`.`t11`.`a` = `test`.`t1`.`a`) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 3 Handler_read_key 3 Handler_read_rnd_next 9 # Status of testing query execution: Variable_name Value Handler_read_first 5 Handler_read_key 7 Handler_read_rnd 2 Handler_read_rnd_next 19 Handler_update 1 Handler_write 4 DROP TABLE t1; DROP VIEW v1; #63 CREATE TABLE t1 (a INT, PRIMARY KEY(a)); INSERT INTO t1 VALUES (1), (2), (3), (4), (5); CREATE VIEW v1 (a) AS SELECT a FROM t1; # # query: DELETE FROM v1 WHERE a < 4 # select: SELECT * FROM v1 WHERE a < 4 # EXPLAIN DELETE FROM v1 WHERE a < 4; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range PRIMARY PRIMARY 4 const X 100.00 Using where FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE FROM v1 WHERE a < 4; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL range PRIMARY PRIMARY 4 const X X Using where Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM v1 WHERE a < 4; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL range PRIMARY PRIMARY 4 NULL X X Using where; Using index Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where (`test`.`t1`.`a` < 4) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_next 3 # Status of testing query execution: Variable_name Value Handler_delete 3 Handler_read_first 1 Handler_read_key 1 Handler_read_next 3 DROP TABLE t1; DROP VIEW v1; #64 CREATE TABLE t1 (a INT, b INT, PRIMARY KEY(a)); INSERT INTO t1 VALUES (1,2), (2,3), (3,4), (4,5), (5,10); CREATE TABLE t2 (x INT); INSERT INTO t2 VALUES (1), (2), (3), (4); CREATE VIEW v1 (a,c) AS SELECT a, b+1 FROM t1; # # query: DELETE v1 FROM t2, v1 WHERE t2.x = v1.a # select: SELECT * FROM t2, v1 WHERE t2.x = v1.a # EXPLAIN DELETE v1 FROM t2, v1 WHERE t2.x = v1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 4 100.00 Using where 1 DELETE t1 NULL eq_ref PRIMARY PRIMARY 4 test.t2.x 1 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE v1 FROM t2, v1 WHERE t2.x = v1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 4 100.00 Using where 1 DELETE t1 NULL eq_ref PRIMARY PRIMARY 4 test.t2.x 1 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2, v1 WHERE t2.x = v1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 4 100.00 Using where 1 SIMPLE t1 NULL eq_ref PRIMARY PRIMARY 4 test.t2.x 1 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`x` AS `x`,`test`.`t1`.`a` AS `a`,(`test`.`t1`.`b` + 1) AS `c` from `test`.`t2` join `test`.`t1` where (`test`.`t1`.`a` = `test`.`t2`.`x`) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 5 Handler_read_rnd_next 5 # Status of testing query execution: Variable_name Value Handler_delete 4 Handler_read_first 1 Handler_read_key 9 Handler_read_rnd 4 Handler_read_rnd_next 5 DROP TABLE t1,t2; DROP VIEW v1; #65 CREATE TABLE t1 (a INT, b INT, PRIMARY KEY(a)); INSERT INTO t1 VALUES (1,2), (2,3), (3,4), (4,5), (5,10); CREATE TABLE t2 (x INT); INSERT INTO t2 VALUES (1), (2), (3), (4); CREATE VIEW v1 (a,c) AS SELECT a, b+1 FROM t1; # # query: DELETE v1 FROM t2, v1 WHERE t2.x = v1.a # select: SELECT * FROM t2, v1 WHERE t2.x = v1.a # EXPLAIN DELETE v1 FROM t2, v1 WHERE t2.x = v1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 4 100.00 Using where 1 DELETE t1 NULL eq_ref PRIMARY PRIMARY 4 test.t2.x 1 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED DELETE v1 FROM t2, v1 WHERE t2.x = v1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 4 100.00 Using where 1 DELETE t1 NULL eq_ref PRIMARY PRIMARY 4 test.t2.x 1 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t2, v1 WHERE t2.x = v1.a; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 4 100.00 Using where 1 SIMPLE t1 NULL eq_ref PRIMARY PRIMARY 4 test.t2.x 1 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t2`.`x` AS `x`,`test`.`t1`.`a` AS `a`,(`test`.`t1`.`b` + 1) AS `c` from `test`.`t2` join `test`.`t1` where (`test`.`t1`.`a` = `test`.`t2`.`x`) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 5 Handler_read_rnd_next 5 # Status of testing query execution: Variable_name Value Handler_delete 4 Handler_read_first 1 Handler_read_key 9 Handler_read_rnd 4 Handler_read_rnd_next 5 DROP TABLE t1,t2; DROP VIEW v1; #66 CREATE TABLE t1 (a INT); CREATE VIEW v1 (x) AS SELECT a FROM t1; # # query: INSERT INTO v1 VALUES (10) # select: SELECT NULL # EXPLAIN INSERT INTO v1 VALUES (10); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t1 NULL ALL NULL NULL NULL NULL NULL NULL NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED INSERT INTO v1 VALUES (10); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t1 NULL ALL NULL NULL NULL NULL NULL NULL NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT NULL; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select NULL AS `NULL` # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value # Status of testing query execution: Variable_name Value Handler_write 1 DROP TABLE t1; DROP VIEW v1; #67 CREATE TABLE t1 (a INT); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (1), (2), (3); CREATE VIEW v1 (x) AS SELECT b FROM t2; # # query: INSERT INTO v1 SELECT * FROM t1 # select: SELECT * FROM t1 # EXPLAIN INSERT INTO v1 SELECT * FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t2 NULL ALL NULL NULL NULL NULL NULL NULL NULL 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 1 100.00 NULL FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED INSERT INTO v1 SELECT * FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t2 NULL ALL NULL NULL NULL NULL NULL NULL NULL 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 1 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 1 100.00 NULL Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 1 # Status of testing query execution: Variable_name Value Handler_read_first 1 Handler_read_key 1 Handler_read_rnd_next 1 DROP TABLE t1, t2; DROP VIEW v1; #69 CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (b INT); INSERT INTO t2 VALUES (1), (2), (3); # # query: UPDATE t1 SET a = 10 WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x) # select: SELECT * FROM t1 WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x) # EXPLAIN UPDATE t1 SET a = 10 WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY <derived3> NULL index_subquery <auto_key0> <auto_key0> 5 func 2 100.00 Using index 3 DERIVED t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using filesort FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 SET a = 10 WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 2 DEPENDENT SUBQUERY <derived3> NULL index_subquery <auto_key0> <auto_key0> 5 func 2 100.00 Using index 3 DERIVED t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1 WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 1 PRIMARY <derived3> NULL ref <auto_key0> <auto_key0> 5 test.t1.a 2 100.00 Using index; FirstMatch(t1) 3 DERIVED t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` semi join ((/* select#3 */ select `test`.`t2`.`b` AS `b` from `test`.`t2` order by `test`.`t2`.`b` limit 2,2) `x`) where (`x`.`b` = `test`.`t1`.`a`) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 5 Handler_read_rnd_next 8 Handler_write 1 Sort_rows 3 Sort_scan 1 # Status of testing query execution: Variable_name Value Handler_read_first 2 Handler_read_key 5 Handler_read_rnd_next 8 Handler_update 1 Handler_write 1 Sort_rows 3 Sort_scan 1 # # query: UPDATE t1, t2 SET a = 10 WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x) # select: SELECT * FROM t1, t2 WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x) # EXPLAIN UPDATE t1, t2 SET a = 10 WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 1 PRIMARY <derived3> NULL ref <auto_key0> <auto_key0> 5 test.t1.a 2 100.00 Using index; FirstMatch(t1) 1 PRIMARY t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 3 DERIVED t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using filesort FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1, t2 SET a = 10 WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 1 PRIMARY <derived3> NULL ref <auto_key0> <auto_key0> 5 test.t1.a 2 100.00 Using index; FirstMatch(t1) 1 PRIMARY t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 3 DERIVED t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1, t2 WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 1 PRIMARY <derived3> NULL ref <auto_key0> <auto_key0> 5 test.t1.a 2 100.00 Using index; FirstMatch(t1) 1 PRIMARY t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using join buffer (Block Nested Loop) 3 DERIVED t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t1` semi join ((/* select#3 */ select `test`.`t2`.`b` AS `b` from `test`.`t2` order by `test`.`t2`.`b` limit 2,2) `x`) join `test`.`t2` where (`x`.`b` = `test`.`t1`.`a`) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 5 Handler_read_rnd_next 8 Handler_write 1 Sort_rows 3 Sort_scan 1 # Status of testing query execution: Variable_name Value Handler_read_first 2 Handler_read_key 5 Handler_read_rnd_next 8 Handler_write 1 Sort_rows 3 Sort_scan 1 # # query: UPDATE t1, (SELECT * FROM t2) y SET a = 10 WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x) # select: SELECT * FROM t1, (SELECT * FROM t2) y WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x) # EXPLAIN UPDATE t1, (SELECT * FROM t2) y SET a = 10 WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 1 PRIMARY <derived4> NULL ref <auto_key0> <auto_key0> 5 test.t1.a 2 100.00 Using index; FirstMatch(t1) 1 PRIMARY t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 4 DERIVED t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using filesort FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1, (SELECT * FROM t2) y SET a = 10 WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 1 PRIMARY <derived4> NULL ref <auto_key0> <auto_key0> 5 test.t1.a 2 100.00 Using index; FirstMatch(t1) 1 PRIMARY t2 NULL ALL NULL NULL NULL NULL 3 100.00 NULL 4 DERIVED t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT * FROM t1, (SELECT * FROM t2) y WHERE a IN (SELECT * FROM (SELECT b FROM t2 ORDER BY b LIMIT 2,2) x); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 1 PRIMARY <derived4> NULL ref <auto_key0> <auto_key0> 5 test.t1.a 2 100.00 Using index; FirstMatch(t1) 1 PRIMARY t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using join buffer (Block Nested Loop) 4 DERIVED t2 NULL ALL NULL NULL NULL NULL 3 100.00 Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t2`.`b` AS `b` from `test`.`t1` semi join ((/* select#4 */ select `test`.`t2`.`b` AS `b` from `test`.`t2` order by `test`.`t2`.`b` limit 2,2) `x`) join `test`.`t2` where (`x`.`b` = `test`.`t1`.`a`) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_first 2 Handler_read_key 5 Handler_read_rnd_next 8 Handler_write 1 Sort_rows 3 Sort_scan 1 # Status of testing query execution: Variable_name Value Handler_read_first 2 Handler_read_key 5 Handler_read_rnd_next 8 Handler_write 1 Sort_rows 3 Sort_scan 1 DROP TABLE t1,t2; #70 CREATE TABLE t1 (c1 INT KEY); CREATE TABLE t2 (c2 INT); CREATE TABLE t3 (c3 INT); EXPLAIN EXTENDED UPDATE t3 SET c3 = ( SELECT COUNT(d1.c1) FROM ( SELECT a11.c1 FROM t1 AS a11 STRAIGHT_JOIN t2 AS a21 ON a21.c2 = a11.c1 JOIN t1 AS a12 ON a12.c1 = a11.c1 ) d1 ); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t3 NULL ALL NULL NULL NULL NULL 1 100.00 NULL 2 SUBQUERY <derived3> NULL ALL NULL NULL NULL NULL 2 100.00 NULL 3 DERIVED a11 NULL index PRIMARY PRIMARY 4 NULL 1 100.00 Using index 3 DERIVED a21 NULL ALL NULL NULL NULL NULL 1 100.00 Using where; Using join buffer (Block Nested Loop) 3 DERIVED a12 NULL eq_ref PRIMARY PRIMARY 4 test.a11.c1 1 100.00 Using index Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. DROP TABLE t1, t2, t3; #71 CREATE TABLE t1 (c1 INT NOT NULL, c2 INT NOT NULL, INDEX i1(c1)); INSERT INTO t1 VALUES (1,0),(2,0),(3,0),(4,0),(5,0),(6,0),(7,0),(8,0); CREATE TABLE t2 LIKE t1; EXPLAIN INSERT INTO t2 SELECT * FROM t1; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t2 NULL ALL NULL NULL NULL NULL X NULL NULL 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL X 100.00 NULL INSERT INTO t2 SELECT * FROM t1; SELECT * FROM t1 LEFT JOIN t2 ON t1.c1 = t2.c1; DROP TABLE t1, t2; #73 CREATE TABLE t1 (id INT); CREATE TABLE t2 (id INT); INSERT INTO t1 VALUES (1), (2); EXPLAIN SELECT * FROM t1 LEFT JOIN t2 USING(id) GROUP BY t1.id; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 1 100.00 Using where; Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`id` AS `id` from `test`.`t1` left join `test`.`t2` on((`test`.`t2`.`id` = `test`.`t1`.`id`)) where 1 group by `test`.`t1`.`id` DROP TABLE t1,t2; #74 CREATE TABLE t1(a INT PRIMARY KEY) ENGINE=InnoDB; INSERT INTO t1 VALUES (1), (2), (3), (4), (5); # used key is modified & Using temporary # # query: UPDATE t1 SET a=a+1 WHERE a>10 # select: SELECT a t1 FROM t1 WHERE a>10 # EXPLAIN UPDATE t1 SET a=a+1 WHERE a>10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL range PRIMARY PRIMARY 4 const 1 100.00 Using where; Using temporary FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 SET a=a+1 WHERE a>10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL range PRIMARY PRIMARY 4 const 1 100.00 Using where; Using temporary Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT a t1 FROM t1 WHERE a>10; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL range PRIMARY PRIMARY 4 NULL 1 100.00 Using where; Using index Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `t1` from `test`.`t1` where (`test`.`t1`.`a` > 10) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 1 # Status of testing query execution: Variable_name Value Handler_read_key 1 # used key is modified & Using filesort # # query: UPDATE t1 SET a=a+1 WHERE a>10 ORDER BY a+20 # select: SELECT a t1 FROM t1 WHERE a>10 ORDER BY a+20 # EXPLAIN UPDATE t1 SET a=a+1 WHERE a>10 ORDER BY a+20; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL range PRIMARY PRIMARY 4 const 1 100.00 Using where; Using filesort FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED UPDATE t1 SET a=a+1 WHERE a>10 ORDER BY a+20; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL range PRIMARY PRIMARY 4 const 1 100.00 Using where; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. # Status of EXPLAIN EXTENDED query Variable_name Value FLUSH STATUS; FLUSH TABLES; EXPLAIN EXTENDED SELECT a t1 FROM t1 WHERE a>10 ORDER BY a+20; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE t1 NULL range PRIMARY PRIMARY 4 NULL 1 100.00 Using where; Using index; Using filesort Warnings: Warning 1681 'EXTENDED' is deprecated and will be removed in a future release. Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `t1` from `test`.`t1` where (`test`.`t1`.`a` > 10) order by (`test`.`t1`.`a` + 20) # Status of EXPLAIN EXTENDED "equivalent" SELECT query execution Variable_name Value # Status of "equivalent" SELECT query execution: Variable_name Value Handler_read_key 1 Sort_range 1 # Status of testing query execution: Variable_name Value Handler_read_key 1 Sort_range 1 DROP TABLE t1; # # Bug #12949629: CLIENT LOSES CONNECTION AFTER EXECUTING A PROCEDURE WITH # EXPLAIN UPDATE/DEL/INS # CREATE TABLE t1 (i INT); CREATE TABLE t2 (i INT); CREATE PROCEDURE p1() BEGIN EXPLAIN INSERT INTO t1 VALUES (1);END| CREATE PROCEDURE p2() BEGIN INSERT INTO t1 VALUES (1);END| CREATE PROCEDURE p3() BEGIN EXPLAIN INSERT INTO t1 SELECT 1;END| CREATE PROCEDURE p4() BEGIN INSERT INTO t1 SELECT 1;END| CREATE PROCEDURE p5() BEGIN EXPLAIN REPLACE INTO t1 VALUES (1);END| CREATE PROCEDURE p6() BEGIN REPLACE INTO t1 VALUES (1);END| CREATE PROCEDURE p7() BEGIN EXPLAIN REPLACE INTO t1 SELECT 1;END| CREATE PROCEDURE p8() BEGIN REPLACE INTO t1 SELECT 1;END| CREATE PROCEDURE p9() BEGIN EXPLAIN UPDATE t1 SET i = 10;END| CREATE PROCEDURE p10() BEGIN UPDATE t1 SET i = 10;END| CREATE PROCEDURE p11() BEGIN EXPLAIN UPDATE t1,t2 SET t1.i = 10 WHERE t1.i = t2.i ;END| CREATE PROCEDURE p12() BEGIN UPDATE t1,t2 SET t1.i = 10 WHERE t1.i = t2.i ;END| CREATE PROCEDURE p13() BEGIN EXPLAIN DELETE FROM t1;END| CREATE PROCEDURE p14() BEGIN DELETE FROM t1;END| CREATE PROCEDURE p15() BEGIN EXPLAIN DELETE FROM t1 USING t1;END| CREATE PROCEDURE p16() BEGIN DELETE FROM t1 USING t1;END| CALL p16(); DROP PROCEDURE p16; CALL p15(); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 1 100.00 NULL DROP PROCEDURE p15; CALL p14(); DROP PROCEDURE p14; CALL p13(); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 DELETE t1 NULL ALL NULL NULL NULL NULL 1 100.00 Deleting all rows DROP PROCEDURE p13; CALL p12(); DROP PROCEDURE p12; CALL p11(); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 1 100.00 NULL 1 SIMPLE t2 NULL ALL NULL NULL NULL NULL 1 100.00 Using where DROP PROCEDURE p11; CALL p10(); DROP PROCEDURE p10; CALL p9(); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL ALL NULL NULL NULL NULL 1 100.00 NULL DROP PROCEDURE p9; CALL p8(); DROP PROCEDURE p8; CALL p7(); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 REPLACE t1 NULL ALL NULL NULL NULL NULL NULL NULL NULL DROP PROCEDURE p7; CALL p6(); DROP PROCEDURE p6; CALL p5(); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 REPLACE t1 NULL ALL NULL NULL NULL NULL NULL NULL NULL DROP PROCEDURE p5; CALL p4(); DROP PROCEDURE p4; CALL p3(); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t1 NULL ALL NULL NULL NULL NULL NULL NULL NULL DROP PROCEDURE p3; CALL p2(); DROP PROCEDURE p2; CALL p1(); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t1 NULL ALL NULL NULL NULL NULL NULL NULL NULL DROP PROCEDURE p1; DROP TABLE t1, t2; # set default_storage_engine= @save_storage_engine; set optimizer_switch=default;
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