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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: 172.26.2.223 | : 18.224.202.121
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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 : explain_json_none.result
set @save_storage_engine= @@default_storage_engine; set default_storage_engine=MyISAM; set end_markers_in_json=on; # new "FORMAT" keyword doesn't conflict with the FORMAT() function name: SELECT FORMAT(1, 2), FORMAT(1, 2, 3); FORMAT(1, 2) FORMAT(1, 2, 3) 1.00 1.00 Warnings: Warning 1649 Unknown locale: '3' # new "FORMAT" keyword is a valid identifier: SET @FORMAT=10; SELECT @FORMAT; @FORMAT 10 CREATE TABLE t1 (format INT); SELECT format FROM t1; format DROP TABLE t1; # different ways of format name writing: EXPLAIN FORMAT=traditional SELECT 1; 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: Note 1003 /* select#1 */ select 1 AS `1` EXPLAIN FORMAT='TrAdItIoNaL' SELECT 1; 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: Note 1003 /* select#1 */ select 1 AS `1` EXPLAIN FORMAT=JSON SELECT 1; EXPLAIN { "query_block": { "select_id": 1, "message": "No tables used" } /* query_block */ } Warnings: Note 1003 /* select#1 */ select 1 AS `1` EXPLAIN FORMAT=foo SELECT 1; ERROR HY000: Unknown EXPLAIN format name: 'foo' # various EXPLAIN output CREATE TABLE t1 (i INT); CREATE TABLE t2 (i INT); CREATE TABLE t3 (i INT); CREATE TABLE t4 (i INT); # no end markers in JSON: set end_markers_in_json=off; EXPLAIN FORMAT=JSON SELECT * FROM t1; EXPLAIN { "query_block": { "select_id": 1, "message": "no matching row in const table" } } Warnings: Note 1003 /* select#1 */ select NULL AS `i` from `test`.`t1` set end_markers_in_json=on; EXPLAIN INSERT INTO t1 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 EXPLAIN FORMAT=JSON INSERT INTO t1 VALUES (10); EXPLAIN { "query_block": { "select_id": 1, "table": { "insert": true, "table_name": "t1", "access_type": "ALL" } /* table */ } /* query_block */ } EXPLAIN SELECT * FROM t1; 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 matching row in const table Warnings: Note 1003 /* select#1 */ select NULL AS `i` from `test`.`t1` PREPARE stmt FROM 'EXPLAIN FORMAT=JSON SELECT * FROM t1'; EXECUTE stmt; EXPLAIN { "query_block": { "select_id": 1, "message": "no matching row in const table" } /* query_block */ } Warnings: Note 1003 /* select#1 */ select NULL AS `i` from `test`.`t1` EXECUTE stmt; EXPLAIN { "query_block": { "select_id": 1, "message": "no matching row in const table" } /* query_block */ } Warnings: Note 1003 /* select#1 */ select NULL AS `i` from `test`.`t1` INSERT INTO t1 VALUES (1), (2), (3), (4), (5), (6), (7); INSERT INTO t2 VALUES (1), (2); # Check materialized derived table set @optimizer_switch_saved= @@optimizer_switch; set optimizer_switch='derived_merge=off'; EXPLAIN SELECT * FROM (SELECT * FROM (SELECT * FROM (SELECT a1.i FROM (SELECT * FROM t1) a1, t2) a2) a3) a4; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> NULL ALL NULL NULL NULL NULL 14 100.00 NULL 2 DERIVED <derived3> NULL ALL NULL NULL NULL NULL 14 100.00 NULL 3 DERIVED <derived4> NULL ALL NULL NULL NULL NULL 14 100.00 NULL 4 DERIVED t2 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 4 DERIVED <derived5> NULL ALL NULL NULL NULL NULL 7 100.00 Using join buffer (Block Nested Loop) 5 DERIVED t1 NULL ALL NULL NULL NULL NULL 7 100.00 NULL Warnings: Note 1003 /* select#1 */ select `a4`.`i` AS `i` from (/* select#2 */ select `a3`.`i` AS `i` from (/* select#3 */ select `a2`.`i` AS `i` from (/* select#4 */ select `a1`.`i` AS `i` from (/* select#5 */ select `test`.`t1`.`i` AS `i` from `test`.`t1`) `a1` join `test`.`t2`) `a2`) `a3`) `a4` EXPLAIN FORMAT=JSON SELECT * FROM (SELECT * FROM (SELECT * FROM (SELECT a1.i FROM (SELECT * FROM t1) a1, t2) a2) a3) a4; EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "13.50" } /* cost_info */, "table": { "table_name": "a4", "access_type": "ALL", "rows_examined_per_scan": 14, "rows_produced_per_join": 14, "filtered": "100.00", "cost_info": { "read_cost": "10.70", "eval_cost": "2.80", "prefix_cost": "13.50", "data_read_per_join": "224" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */, "materialized_from_subquery": { "using_temporary_table": true, "dependent": false, "cacheable": true, "query_block": { "select_id": 2, "cost_info": { "query_cost": "13.50" } /* cost_info */, "table": { "table_name": "a3", "access_type": "ALL", "rows_examined_per_scan": 14, "rows_produced_per_join": 14, "filtered": "100.00", "cost_info": { "read_cost": "10.70", "eval_cost": "2.80", "prefix_cost": "13.50", "data_read_per_join": "224" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */, "materialized_from_subquery": { "using_temporary_table": true, "dependent": false, "cacheable": true, "query_block": { "select_id": 3, "cost_info": { "query_cost": "13.50" } /* cost_info */, "table": { "table_name": "a2", "access_type": "ALL", "rows_examined_per_scan": 14, "rows_produced_per_join": 14, "filtered": "100.00", "cost_info": { "read_cost": "10.70", "eval_cost": "2.80", "prefix_cost": "13.50", "data_read_per_join": "224" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */, "materialized_from_subquery": { "using_temporary_table": true, "dependent": false, "cacheable": true, "query_block": { "select_id": 4, "cost_info": { "query_cost": "15.55" } /* cost_info */, "nested_loop": [ { "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */ } /* table */ }, { "table": { "table_name": "a1", "access_type": "ALL", "rows_examined_per_scan": 7, "rows_produced_per_join": 14, "filtered": "100.00", "using_join_buffer": "Block Nested Loop", "cost_info": { "read_cost": "10.35", "eval_cost": "2.80", "prefix_cost": "15.55", "data_read_per_join": "224" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */, "materialized_from_subquery": { "using_temporary_table": true, "dependent": false, "cacheable": true, "query_block": { "select_id": 5, "cost_info": { "query_cost": "3.41" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 7, "rows_produced_per_join": 7, "filtered": "100.00", "cost_info": { "read_cost": "2.01", "eval_cost": "1.40", "prefix_cost": "3.41", "data_read_per_join": "56" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* query_block */ } /* materialized_from_subquery */ } /* table */ } ] /* nested_loop */ } /* query_block */ } /* materialized_from_subquery */ } /* table */ } /* query_block */ } /* materialized_from_subquery */ } /* table */ } /* query_block */ } /* materialized_from_subquery */ } /* table */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select `a4`.`i` AS `i` from (/* select#2 */ select `a3`.`i` AS `i` from (/* select#3 */ select `a2`.`i` AS `i` from (/* select#4 */ select `a1`.`i` AS `i` from (/* select#5 */ select `test`.`t1`.`i` AS `i` from `test`.`t1`) `a1` join `test`.`t2`) `a2`) `a3`) `a4` set optimizer_switch= @optimizer_switch_saved; # subquery in WHERE EXPLAIN SELECT * FROM t1 WHERE i IN (SELECT i FROM t2 WHERE t1.i = 10 ORDER BY RAND()); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 7 100.00 Using where 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 2 50.00 Using where Warnings: Note 1276 Field or reference 'test.t1.i' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`i`,<exists>(/* select#2 */ select 1 from `test`.`t2` where ((`test`.`t1`.`i` = 10) and (<cache>(`test`.`t1`.`i`) = `test`.`t2`.`i`)))) EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE i IN (SELECT i FROM t2 WHERE t1.i = 10 ORDER BY RAND()); EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "3.41" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 7, "rows_produced_per_join": 7, "filtered": "100.00", "cost_info": { "read_cost": "2.01", "eval_cost": "1.40", "prefix_cost": "3.41", "data_read_per_join": "56" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */, "attached_condition": "<in_optimizer>(`test`.`t1`.`i`,<exists>(/* select#2 */ select 1 from `test`.`t2` where ((`test`.`t1`.`i` = 10) and (<cache>(`test`.`t1`.`i`) = `test`.`t2`.`i`))))", "attached_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 2, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 1, "filtered": "50.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.20", "prefix_cost": "2.40", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */, "attached_condition": "((`test`.`t1`.`i` = 10) and (<cache>(`test`.`t1`.`i`) = `test`.`t2`.`i`))" } /* table */ } /* query_block */ } ] /* attached_subqueries */ } /* table */ } /* query_block */ } Warnings: Note 1276 Field or reference 'test.t1.i' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`i`,<exists>(/* select#2 */ select 1 from `test`.`t2` where ((`test`.`t1`.`i` = 10) and (<cache>(`test`.`t1`.`i`) = `test`.`t2`.`i`)))) # two subqueries in WHERE EXPLAIN SELECT * FROM t1 WHERE i IN (SELECT i FROM t2 WHERE t1.i = 10 ORDER BY RAND()) OR i IN (SELECT i FROM t4 ORDER BY RAND()); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 7 100.00 Using where 3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 2 50.00 Using where Warnings: Note 1276 Field or reference 'test.t1.i' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` where (<in_optimizer>(`test`.`t1`.`i`,<exists>(/* select#2 */ select 1 from `test`.`t2` where ((`test`.`t1`.`i` = 10) and (<cache>(`test`.`t1`.`i`) = `test`.`t2`.`i`)))) or <in_optimizer>(`test`.`t1`.`i`,<exists>(/* select#3 */ select 1 from `test`.`t4` where (<cache>(`test`.`t1`.`i`) = NULL)))) EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE i IN (SELECT i FROM t2 WHERE t1.i = 10 ORDER BY RAND()) OR i IN (SELECT i FROM t4 ORDER BY RAND()); EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "3.41" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 7, "rows_produced_per_join": 7, "filtered": "100.00", "cost_info": { "read_cost": "2.01", "eval_cost": "1.40", "prefix_cost": "3.41", "data_read_per_join": "56" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */, "attached_condition": "(<in_optimizer>(`test`.`t1`.`i`,<exists>(/* select#2 */ select 1 from `test`.`t2` where ((`test`.`t1`.`i` = 10) and (<cache>(`test`.`t1`.`i`) = `test`.`t2`.`i`)))) or <in_optimizer>(`test`.`t1`.`i`,<exists>(/* select#3 */ select 1 from `test`.`t4` where (<cache>(`test`.`t1`.`i`) = NULL))))", "attached_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 3, "message": "no matching row in const table" } /* query_block */ }, { "dependent": true, "cacheable": false, "query_block": { "select_id": 2, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 1, "filtered": "50.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.20", "prefix_cost": "2.40", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */, "attached_condition": "((`test`.`t1`.`i` = 10) and (<cache>(`test`.`t1`.`i`) = `test`.`t2`.`i`))" } /* table */ } /* query_block */ } ] /* attached_subqueries */ } /* table */ } /* query_block */ } Warnings: Note 1276 Field or reference 'test.t1.i' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` where (<in_optimizer>(`test`.`t1`.`i`,<exists>(/* select#2 */ select 1 from `test`.`t2` where ((`test`.`t1`.`i` = 10) and (<cache>(`test`.`t1`.`i`) = `test`.`t2`.`i`)))) or <in_optimizer>(`test`.`t1`.`i`,<exists>(/* select#3 */ select 1 from `test`.`t4` where (<cache>(`test`.`t1`.`i`) = NULL)))) # simple UNION EXPLAIN SELECT * FROM t1 UNION SELECT * FROM t2 UNION SELECT * FROM t3; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 7 100.00 NULL 2 UNION t2 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 3 UNION NULL NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table NULL UNION RESULT <union1,2,3> NULL ALL NULL NULL NULL NULL NULL NULL Using temporary Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` union /* select#2 */ select `test`.`t2`.`i` AS `i` from `test`.`t2` union /* select#3 */ select NULL AS `i` from `test`.`t3` EXPLAIN FORMAT=JSON SELECT * FROM t1 UNION SELECT * FROM t2 UNION SELECT * FROM t3; EXPLAIN { "query_block": { "union_result": { "using_temporary_table": true, "table_name": "<union1,2,3>", "access_type": "ALL", "query_specifications": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 1, "cost_info": { "query_cost": "3.41" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 7, "rows_produced_per_join": 7, "filtered": "100.00", "cost_info": { "read_cost": "2.01", "eval_cost": "1.40", "prefix_cost": "3.41", "data_read_per_join": "56" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* query_block */ }, { "dependent": false, "cacheable": true, "query_block": { "select_id": 2, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* query_block */ }, { "dependent": false, "cacheable": true, "query_block": { "select_id": 3, "message": "no matching row in const table" } /* query_block */ } ] /* query_specifications */ } /* union_result */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` union /* select#2 */ select `test`.`t2`.`i` AS `i` from `test`.`t2` union /* select#3 */ select NULL AS `i` from `test`.`t3` # more complex UNION EXPLAIN (SELECT t1.i FROM t1 JOIN t2) UNION ALL (SELECT * FROM t3 WHERE i IN (SELECT i FROM t4 ORDER BY RAND())); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t2 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 7 100.00 Using join buffer (Block Nested Loop) 2 UNION NULL NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table 3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL NULL no matching row in const table Warnings: Note 1003 (/* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` join `test`.`t2`) union all (/* select#2 */ select NULL AS `i` from `test`.`t3` where <in_optimizer>(NULL,<exists>(/* select#3 */ select 1 from `test`.`t4` where (<cache>(NULL) = NULL)))) EXPLAIN FORMAT=JSON (SELECT t1.i FROM t1 JOIN t2) UNION ALL (SELECT * FROM t3 WHERE i IN (SELECT i FROM t4 ORDER BY RAND())); EXPLAIN { "query_block": { "union_result": { "using_temporary_table": false, "query_specifications": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 1, "cost_info": { "query_cost": "7.21" } /* cost_info */, "nested_loop": [ { "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */ } /* table */ }, { "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 7, "rows_produced_per_join": 14, "filtered": "100.00", "using_join_buffer": "Block Nested Loop", "cost_info": { "read_cost": "2.01", "eval_cost": "2.80", "prefix_cost": "7.22", "data_read_per_join": "112" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } ] /* nested_loop */ } /* query_block */ }, { "dependent": false, "cacheable": true, "query_block": { "select_id": 2, "message": "no matching row in const table", "optimized_away_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 3, "message": "no matching row in const table" } /* query_block */ } ] /* optimized_away_subqueries */ } /* query_block */ } ] /* query_specifications */ } /* union_result */ } /* query_block */ } Warnings: Note 1003 (/* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` join `test`.`t2`) union all (/* select#2 */ select NULL AS `i` from `test`.`t3` where <in_optimizer>(NULL,<exists>(/* select#3 */ select 1 from `test`.`t4` where (<cache>(NULL) = NULL)))) # UNION with subquery in outer ORDER BY EXPLAIN (SELECT * FROM t1) UNION (SELECT * FROM t2) ORDER BY (SELECT i LIMIT 1); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 7 100.00 NULL 2 UNION t2 NULL ALL NULL NULL NULL NULL 2 100.00 NULL NULL UNION RESULT <union1,2> NULL ALL NULL NULL NULL NULL NULL NULL Using temporary; Using filesort 3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1276 Field or reference 'i' of SELECT #3 was resolved in SELECT #1 Note 1003 (/* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1`) union (/* select#2 */ select `test`.`t2`.`i` AS `i` from `test`.`t2`) order by (/* select#3 */ select `i` limit 1) EXPLAIN FORMAT=JSON (SELECT * FROM t1) UNION (SELECT * FROM t2) ORDER BY (SELECT i LIMIT 1); EXPLAIN { "query_block": { "ordering_operation": { "using_filesort": true, "union_result": { "using_temporary_table": true, "table_name": "<union1,2>", "access_type": "ALL", "query_specifications": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 1, "cost_info": { "query_cost": "3.41" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 7, "rows_produced_per_join": 7, "filtered": "100.00", "cost_info": { "read_cost": "2.01", "eval_cost": "1.40", "prefix_cost": "3.41", "data_read_per_join": "56" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* query_block */ }, { "dependent": false, "cacheable": true, "query_block": { "select_id": 2, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* query_block */ } ] /* query_specifications */ } /* union_result */, "order_by_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 3, "message": "No tables used" } /* query_block */ } ] /* order_by_subqueries */ } /* ordering_operation */ } /* query_block */ } Warnings: Note 1276 Field or reference 'i' of SELECT #3 was resolved in SELECT #1 Note 1003 (/* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1`) union (/* select#2 */ select `test`.`t2`.`i` AS `i` from `test`.`t2`) order by (/* select#3 */ select `i` limit 1) # optimizer-time subquery EXPLAIN SELECT * FROM t1 ORDER BY (SELECT LENGTH(1) FROM t2 LIMIT 1); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 7 100.00 NULL 2 SUBQUERY t2 NULL ALL NULL NULL NULL NULL 2 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` order by (/* select#2 */ select length(1) from `test`.`t2` limit 1) EXPLAIN FORMAT=JSON SELECT * FROM t1 ORDER BY (SELECT LENGTH(1) FROM t2 LIMIT 1); EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "3.41" } /* cost_info */, "ordering_operation": { "using_filesort": false, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 7, "rows_produced_per_join": 7, "filtered": "100.00", "cost_info": { "read_cost": "2.01", "eval_cost": "1.40", "prefix_cost": "3.41", "data_read_per_join": "56" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */, "optimized_away_subqueries": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 2, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */ } /* table */ } /* query_block */ } ] /* optimized_away_subqueries */ } /* ordering_operation */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` order by (/* select#2 */ select length(1) from `test`.`t2` limit 1) # subquery in the HAVING clause EXPLAIN SELECT * FROM t1 HAVING i > ALL (SELECT i FROM t2) OR i < ALL (SELECT i FROM t2);; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 7 100.00 NULL 3 SUBQUERY t2 NULL ALL NULL NULL NULL NULL 2 100.00 NULL 2 SUBQUERY t2 NULL ALL NULL NULL NULL NULL 2 100.00 NULL Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` having (<not>((`test`.`t1`.`i` <= <max>(/* select#2 */ select `test`.`t2`.`i` from `test`.`t2`))) or <not>((`test`.`t1`.`i` >= <min>(/* select#3 */ select `test`.`t2`.`i` from `test`.`t2`)))) EXPLAIN FORMAT=JSON SELECT * FROM t1 HAVING i > ALL (SELECT i FROM t2) OR i < ALL (SELECT i FROM t2);; EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "3.41" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 7, "rows_produced_per_join": 7, "filtered": "100.00", "cost_info": { "read_cost": "2.01", "eval_cost": "1.40", "prefix_cost": "3.41", "data_read_per_join": "56" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */, "having_subqueries": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 3, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* query_block */ }, { "dependent": false, "cacheable": true, "query_block": { "select_id": 2, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* query_block */ } ] /* having_subqueries */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` having (<not>((`test`.`t1`.`i` <= <max>(/* select#2 */ select `test`.`t2`.`i` from `test`.`t2`))) or <not>((`test`.`t1`.`i` >= <min>(/* select#3 */ select `test`.`t2`.`i` from `test`.`t2`)))) # subquery in the GROUP BY clause EXPLAIN SELECT * FROM t1 GROUP BY i > ALL (SELECT i FROM t2) OR i < ALL (SELECT i FROM t2);; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 7 100.00 Using temporary; Using filesort 3 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 2 100.00 Using where 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 2 100.00 Using where Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` group by (<not>(<in_optimizer>(`test`.`t1`.`i`,<exists>(/* select#2 */ select 1 from `test`.`t2` where <if>(outer_field_is_not_null, ((<cache>(`test`.`t1`.`i`) <= `test`.`t2`.`i`) or isnull(`test`.`t2`.`i`)), true) having <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t2`.`i`), true)))) or <not>(<in_optimizer>(`test`.`t1`.`i`,<exists>(/* select#3 */ select 1 from `test`.`t2` where <if>(outer_field_is_not_null, ((<cache>(`test`.`t1`.`i`) >= `test`.`t2`.`i`) or isnull(`test`.`t2`.`i`)), true) having <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t2`.`i`), true))))) EXPLAIN FORMAT=JSON SELECT * FROM t1 GROUP BY i > ALL (SELECT i FROM t2) OR i < ALL (SELECT i FROM t2);; EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "10.41" } /* cost_info */, "grouping_operation": { "using_temporary_table": true, "using_filesort": true, "cost_info": { "sort_cost": "7.00" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 7, "rows_produced_per_join": 7, "filtered": "100.00", "cost_info": { "read_cost": "2.01", "eval_cost": "1.40", "prefix_cost": "3.41", "data_read_per_join": "56" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */, "group_by_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 3, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */, "attached_condition": "<if>(outer_field_is_not_null, ((<cache>(`test`.`t1`.`i`) >= `test`.`t2`.`i`) or isnull(`test`.`t2`.`i`)), true)" } /* table */ } /* query_block */ }, { "dependent": true, "cacheable": false, "query_block": { "select_id": 2, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */, "attached_condition": "<if>(outer_field_is_not_null, ((<cache>(`test`.`t1`.`i`) <= `test`.`t2`.`i`) or isnull(`test`.`t2`.`i`)), true)" } /* table */ } /* query_block */ } ] /* group_by_subqueries */ } /* grouping_operation */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` group by (<not>(<in_optimizer>(`test`.`t1`.`i`,<exists>(/* select#2 */ select 1 from `test`.`t2` where <if>(outer_field_is_not_null, ((<cache>(`test`.`t1`.`i`) <= `test`.`t2`.`i`) or isnull(`test`.`t2`.`i`)), true) having <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t2`.`i`), true)))) or <not>(<in_optimizer>(`test`.`t1`.`i`,<exists>(/* select#3 */ select 1 from `test`.`t2` where <if>(outer_field_is_not_null, ((<cache>(`test`.`t1`.`i`) >= `test`.`t2`.`i`) or isnull(`test`.`t2`.`i`)), true) having <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t2`.`i`), true))))) # subquery in the SELECT list EXPLAIN SELECT (SELECT i + 1 FROM t1 ORDER BY RAND() LIMIT 1), i 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 7 100.00 NULL 2 UNCACHEABLE SUBQUERY t1 NULL ALL NULL NULL NULL NULL 7 100.00 Using temporary; Using filesort Warnings: Note 1003 /* select#1 */ select (/* select#2 */ select (`test`.`t1`.`i` + 1) from `test`.`t1` order by rand() limit 1) AS `(SELECT i + 1 FROM t1 ORDER BY RAND() LIMIT 1)`,`test`.`t1`.`i` AS `i` from `test`.`t1` EXPLAIN FORMAT=JSON SELECT (SELECT i + 1 FROM t1 ORDER BY RAND() LIMIT 1), i FROM t1;; EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "3.41" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 7, "rows_produced_per_join": 7, "filtered": "100.00", "cost_info": { "read_cost": "2.01", "eval_cost": "1.40", "prefix_cost": "3.41", "data_read_per_join": "56" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */, "select_list_subqueries": [ { "dependent": false, "cacheable": false, "query_block": { "select_id": 2, "cost_info": { "query_cost": "3.41" } /* cost_info */, "ordering_operation": { "using_temporary_table": true, "using_filesort": true, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 7, "rows_produced_per_join": 7, "filtered": "100.00", "cost_info": { "read_cost": "2.01", "eval_cost": "1.40", "prefix_cost": "3.41", "data_read_per_join": "56" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* ordering_operation */ } /* query_block */ } ] /* select_list_subqueries */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select (/* select#2 */ select (`test`.`t1`.`i` + 1) from `test`.`t1` order by rand() limit 1) AS `(SELECT i + 1 FROM t1 ORDER BY RAND() LIMIT 1)`,`test`.`t1`.`i` AS `i` from `test`.`t1` DROP TABLE t1, t2, t3, t4; # derived table that is optimized out CREATE TABLE t1 (i INT); EXPLAIN SELECT 1 FROM (SELECT 1 AS x FROM t1) tt WHERE x; 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 matching row in const table Warnings: Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` where 1 EXPLAIN FORMAT= JSON SELECT 1 FROM (SELECT 1 AS x FROM t1) tt WHERE x; EXPLAIN { "query_block": { "select_id": 1, "message": "no matching row in const table" } /* query_block */ } Warnings: Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` where 1 DROP TABLE t1; # complex subqueries CREATE TABLE t1 (a INT, b INT); CREATE TABLE t2 (c INT, d INT); CREATE TABLE t3 (e INT); CREATE TABLE t4 (f INT, g INT); INSERT INTO t1 VALUES (1,10), (2,10); INSERT INTO t2 VALUES (2,10), (2,20); INSERT INTO t3 VALUES (10), (30); INSERT INTO t4 VALUES (2,10), (2,10); EXPLAIN SELECT * FROM t1 WHERE t1.a IN (SELECT c FROM t2 WHERE (SELECT e FROM t3) < SOME(SELECT e FROM t3 WHERE t1.b));; 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 Using where 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 2 50.00 Using where 4 DEPENDENT SUBQUERY t3 NULL ALL NULL NULL NULL NULL 2 100.00 Using where 3 SUBQUERY t3 NULL ALL NULL NULL NULL NULL 2 100.00 NULL Warnings: Note 1276 Field or reference 'test.t1.b' of SELECT #4 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,<exists>(/* select#2 */ select 1 from `test`.`t2` where (<nop>(<in_optimizer>((/* select#3 */ select `test`.`t3`.`e` from `test`.`t3`),<exists>(/* select#4 */ select 1 from `test`.`t3` where (`test`.`t1`.`b` and <if>(outer_field_is_not_null, ((<cache>((/* select#3 */ select `test`.`t3`.`e` from `test`.`t3`)) < `test`.`t3`.`e`) or isnull(`test`.`t3`.`e`)), true)) having <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t3`.`e`), true)))) and (<cache>(`test`.`t1`.`a`) = `test`.`t2`.`c`)))) EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE t1.a IN (SELECT c FROM t2 WHERE (SELECT e FROM t3) < SOME(SELECT e FROM t3 WHERE t1.b));; EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "32" } /* cost_info */, "used_columns": [ "a", "b" ] /* used_columns */, "attached_condition": "<in_optimizer>(`test`.`t1`.`a`,<exists>(/* select#2 */ select 1 from `test`.`t2` where (<nop>(<in_optimizer>((/* select#3 */ select `test`.`t3`.`e` from `test`.`t3`),<exists>(/* select#4 */ select 1 from `test`.`t3` where (`test`.`t1`.`b` and <if>(outer_field_is_not_null, ((<cache>((/* select#3 */ select `test`.`t3`.`e` from `test`.`t3`)) < `test`.`t3`.`e`) or isnull(`test`.`t3`.`e`)), true)) having <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t3`.`e`), true)))) and (<cache>(`test`.`t1`.`a`) = `test`.`t2`.`c`))))", "attached_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 2, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 1, "filtered": "50.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.20", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "c" ] /* used_columns */, "attached_condition": "(<nop>(<in_optimizer>((/* select#3 */ select `test`.`t3`.`e` from `test`.`t3`),<exists>(/* select#4 */ select 1 from `test`.`t3` where (`test`.`t1`.`b` and <if>(outer_field_is_not_null, ((<cache>((/* select#3 */ select `test`.`t3`.`e` from `test`.`t3`)) < `test`.`t3`.`e`) or isnull(`test`.`t3`.`e`)), true)) having <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t3`.`e`), true)))) and (<cache>(`test`.`t1`.`a`) = `test`.`t2`.`c`))", "attached_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 4, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t3", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "e" ] /* used_columns */, "attached_condition": "(`test`.`t1`.`b` and <if>(outer_field_is_not_null, ((<cache>((/* select#3 */ select `test`.`t3`.`e` from `test`.`t3`)) < `test`.`t3`.`e`) or isnull(`test`.`t3`.`e`)), true))" } /* table */ } /* query_block */ }, { "dependent": false, "cacheable": true, "query_block": { "select_id": 3, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t3", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "e" ] /* used_columns */ } /* table */ } /* query_block */ } ] /* attached_subqueries */ } /* table */ } /* query_block */ } ] /* attached_subqueries */ } /* table */ } /* query_block */ } Warnings: Note 1276 Field or reference 'test.t1.b' of SELECT #4 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where <in_optimizer>(`test`.`t1`.`a`,<exists>(/* select#2 */ select 1 from `test`.`t2` where (<nop>(<in_optimizer>((/* select#3 */ select `test`.`t3`.`e` from `test`.`t3`),<exists>(/* select#4 */ select 1 from `test`.`t3` where (`test`.`t1`.`b` and <if>(outer_field_is_not_null, ((<cache>((/* select#3 */ select `test`.`t3`.`e` from `test`.`t3`)) < `test`.`t3`.`e`) or isnull(`test`.`t3`.`e`)), true)) having <if>(outer_field_is_not_null, <is_not_null_test>(`test`.`t3`.`e`), true)))) and (<cache>(`test`.`t1`.`a`) = `test`.`t2`.`c`)))) DROP TABLE t1, t2, t3, t4; # semi-join materialization (if enabled) CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1), (1), (1), (1), (1), (1), (1), (1), (1), (1), (1), (1); CREATE TABLE t2 (a INT) SELECT * FROM t1; CREATE TABLE t3 (a INT) SELECT * FROM t1; CREATE TABLE t4 (a INT) SELECT * FROM t1; EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE t1.a IN (SELECT t2.a FROM t2 WHERE t2.a > 0) AND t1.a IN (SELECT t3.a FROM t3 WHERE t3.a IN (SELECT t4.a FROM t4 WHERE a > 0)); EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "4.42" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 12, "rows_produced_per_join": 12, "filtered": "100.00", "cost_info": { "read_cost": "2.02", "eval_cost": "2.40", "prefix_cost": "4.42", "data_read_per_join": "96" } /* cost_info */, "used_columns": [ "a" ] /* used_columns */, "attached_condition": "(<in_optimizer>(`test`.`t1`.`a`,<exists>(/* select#2 */ select 1 from `test`.`t2` where ((`test`.`t2`.`a` > 0) and (<cache>(`test`.`t1`.`a`) = `test`.`t2`.`a`)))) and <in_optimizer>(`test`.`t1`.`a`,<exists>(/* select#3 */ select 1 from `test`.`t3` where (<in_optimizer>(`test`.`t3`.`a`,<exists>(/* select#4 */ select 1 from `test`.`t4` where ((`test`.`t4`.`a` > 0) and (<cache>(`test`.`t3`.`a`) = `test`.`t4`.`a`)))) and (<cache>(`test`.`t1`.`a`) = `test`.`t3`.`a`)))))", "attached_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 3, "cost_info": { "query_cost": "4.42" } /* cost_info */, "table": { "table_name": "t3", "access_type": "ALL", "rows_examined_per_scan": 12, "rows_produced_per_join": 1, "filtered": "10.00", "cost_info": { "read_cost": "2.02", "eval_cost": "0.24", "prefix_cost": "4.42", "data_read_per_join": "9" } /* cost_info */, "used_columns": [ "a" ] /* used_columns */, "attached_condition": "(<in_optimizer>(`test`.`t3`.`a`,<exists>(/* select#4 */ select 1 from `test`.`t4` where ((`test`.`t4`.`a` > 0) and (<cache>(`test`.`t3`.`a`) = `test`.`t4`.`a`)))) and (<cache>(`test`.`t1`.`a`) = `test`.`t3`.`a`))", "attached_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 4, "cost_info": { "query_cost": "4.42" } /* cost_info */, "table": { "table_name": "t4", "access_type": "ALL", "rows_examined_per_scan": 12, "rows_produced_per_join": 0, "filtered": "8.33", "cost_info": { "read_cost": "3.62", "eval_cost": "0.20", "prefix_cost": "4.42", "data_read_per_join": "7" } /* cost_info */, "used_columns": [ "a" ] /* used_columns */, "attached_condition": "((`test`.`t4`.`a` > 0) and (<cache>(`test`.`t3`.`a`) = `test`.`t4`.`a`))" } /* table */ } /* query_block */ } ] /* attached_subqueries */ } /* table */ } /* query_block */ }, { "dependent": true, "cacheable": false, "query_block": { "select_id": 2, "cost_info": { "query_cost": "4.42" } /* cost_info */, "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 12, "rows_produced_per_join": 0, "filtered": "8.33", "cost_info": { "read_cost": "3.62", "eval_cost": "0.20", "prefix_cost": "4.42", "data_read_per_join": "7" } /* cost_info */, "used_columns": [ "a" ] /* used_columns */, "attached_condition": "((`test`.`t2`.`a` > 0) and (<cache>(`test`.`t1`.`a`) = `test`.`t2`.`a`))" } /* table */ } /* query_block */ } ] /* attached_subqueries */ } /* table */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where (<in_optimizer>(`test`.`t1`.`a`,<exists>(/* select#2 */ select 1 from `test`.`t2` where ((`test`.`t2`.`a` > 0) and (<cache>(`test`.`t1`.`a`) = `test`.`t2`.`a`)))) and <in_optimizer>(`test`.`t1`.`a`,<exists>(/* select#3 */ select 1 from `test`.`t3` where (<in_optimizer>(`test`.`t3`.`a`,<exists>(/* select#4 */ select 1 from `test`.`t4` where ((`test`.`t4`.`a` > 0) and (<cache>(`test`.`t3`.`a`) = `test`.`t4`.`a`)))) and (<cache>(`test`.`t1`.`a`) = `test`.`t3`.`a`))))) DROP TABLE t1, t2, t3, t4; # the same subquery is associated with two different JOIN_TABs CREATE TABLE t1 ( i1 INTEGER NOT NULL, c1 VARCHAR(1) NOT NULL ) ENGINE=InnoDB; INSERT INTO t1 VALUES (2,'w'); CREATE TABLE t2 ( i1 INTEGER NOT NULL, c1 VARCHAR(1) NOT NULL, c2 VARCHAR(1) NOT NULL, KEY (c1, i1) ) ENGINE=InnoDB; INSERT INTO t2 VALUES (8,'d','d'); INSERT INTO t2 VALUES (4,'v','v'); CREATE TABLE t3 ( c1 VARCHAR(1) NOT NULL ) ENGINE=InnoDB; INSERT INTO t3 VALUES ('v'); EXPLAIN FORMAT=json SELECT i1 FROM t1 WHERE EXISTS (SELECT t2.c1 FROM (t2 INNER JOIN t3 ON (t3.c1 = t2.c1)) WHERE t2.c2 != t1.c1 AND t2.c2 = (SELECT MIN(t3.c1) FROM t3)); EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "1.20" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "1.00", "eval_cost": "0.20", "prefix_cost": "1.20", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "i1", "c1" ] /* used_columns */, "attached_condition": "exists(/* select#2 */ select `test`.`t2`.`c1` from `test`.`t2` join `test`.`t3` where ((`test`.`t2`.`c1` = `test`.`t3`.`c1`) and (`test`.`t2`.`c2` = (/* select#3 */ select min(`test`.`t3`.`c1`) from `test`.`t3`)) and ((/* select#3 */ select min(`test`.`t3`.`c1`) from `test`.`t3`) <> `test`.`t1`.`c1`)))", "attached_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 2, "cost_info": { "query_cost": "2.40" } /* cost_info */, "nested_loop": [ { "table": { "table_name": "t3", "access_type": "ALL", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "1.00", "eval_cost": "0.20", "prefix_cost": "1.20", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "c1" ] /* used_columns */, "attached_condition": "((/* select#3 */ select min(`test`.`t3`.`c1`) from `test`.`t3`) <> `test`.`t1`.`c1`)", "attached_subqueries": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 3, "cost_info": { "query_cost": "1.20" } /* cost_info */, "table": { "table_name": "t3", "access_type": "ALL", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "1.00", "eval_cost": "0.20", "prefix_cost": "1.20", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "c1" ] /* used_columns */ } /* table */ } /* query_block */ } ] /* attached_subqueries */ } /* table */ }, { "table": { "table_name": "t2", "access_type": "ref", "possible_keys": [ "c1" ] /* possible_keys */, "key": "c1", "used_key_parts": [ "c1" ] /* used_key_parts */, "key_length": "3", "ref": [ "test.t3.c1" ] /* ref */, "rows_examined_per_scan": 1, "rows_produced_per_join": 0, "filtered": "50.00", "cost_info": { "read_cost": "1.00", "eval_cost": "0.10", "prefix_cost": "2.40", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "c1", "c2" ] /* used_columns */, "attached_condition": "(`test`.`t2`.`c2` = (/* select#3 */ select min(`test`.`t3`.`c1`) from `test`.`t3`))", "attached_subqueries": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 3, "cost_info": { "query_cost": "1.20" } /* cost_info */, "table": { "table_name": "t3", "access_type": "ALL", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "1.00", "eval_cost": "0.20", "prefix_cost": "1.20", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "c1" ] /* used_columns */ } /* table */ } /* query_block */ } ] /* attached_subqueries */ } /* table */ } ] /* nested_loop */ } /* query_block */ } ] /* attached_subqueries */ } /* table */ } /* query_block */ } Warnings: Note 1276 Field or reference 'test.t1.c1' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t1`.`i1` AS `i1` from `test`.`t1` where exists(/* select#2 */ select `test`.`t2`.`c1` from `test`.`t2` join `test`.`t3` where ((`test`.`t2`.`c1` = `test`.`t3`.`c1`) and (`test`.`t2`.`c2` = (/* select#3 */ select min(`test`.`t3`.`c1`) from `test`.`t3`)) and ((/* select#3 */ select min(`test`.`t3`.`c1`) from `test`.`t3`) <> `test`.`t1`.`c1`))) DROP TABLE t1, t2, t3; # multiple materialization groups CREATE TABLE t1 (c_key INT, KEY c_key (c_key)); INSERT INTO t1 VALUES (1), (2), (3); CREATE TABLE t2 (c INT, c_key INT); INSERT INTO t2 VALUES (8,5),(4,5),(8,1); CREATE TABLE t3 LIKE t1; INSERT INTO t3 SELECT * FROM t1; CREATE TABLE t4 LIKE t2; INSERT INTO t4 SELECT * FROM t2; CREATE TABLE t5 (c INT); INSERT INTO t5 VALUES (1), (2), (3); # This should show two materialization groups where applicable EXPLAIN SELECT * FROM t5 WHERE c IN (SELECT t2.c FROM t1 JOIN t2 ON t2.c_key = t1.c_key) AND c IN (SELECT t4.c FROM t3 JOIN t4 ON t4.c_key = t3.c_key); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t5 NULL ALL NULL NULL NULL NULL 3 100.00 Using where 3 DEPENDENT SUBQUERY t4 NULL ALL NULL NULL NULL NULL 3 33.33 Using where 3 DEPENDENT SUBQUERY t3 NULL ref c_key c_key 5 test.t4.c_key 1 100.00 Using index 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 3 33.33 Using where 2 DEPENDENT SUBQUERY t1 NULL ref c_key c_key 5 test.t2.c_key 2 100.00 Using index Warnings: Note 1003 /* select#1 */ select `test`.`t5`.`c` AS `c` from `test`.`t5` where (<in_optimizer>(`test`.`t5`.`c`,<exists>(/* select#2 */ select 1 from `test`.`t1` join `test`.`t2` where ((`test`.`t1`.`c_key` = `test`.`t2`.`c_key`) and (<cache>(`test`.`t5`.`c`) = `test`.`t2`.`c`)))) and <in_optimizer>(`test`.`t5`.`c`,<exists>(/* select#3 */ select 1 from `test`.`t3` join `test`.`t4` where ((`test`.`t3`.`c_key` = `test`.`t4`.`c_key`) and (<cache>(`test`.`t5`.`c`) = `test`.`t4`.`c`))))) EXPLAIN FORMAT=JSON SELECT * FROM t5 WHERE c IN (SELECT t2.c FROM t1 JOIN t2 ON t2.c_key = t1.c_key) AND c IN (SELECT t4.c FROM t3 JOIN t4 ON t4.c_key = t3.c_key); EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "2.60" } /* cost_info */, "table": { "table_name": "t5", "access_type": "ALL", "rows_examined_per_scan": 3, "rows_produced_per_join": 3, "filtered": "100.00", "cost_info": { "read_cost": "2.01", "eval_cost": "0.60", "prefix_cost": "2.61", "data_read_per_join": "24" } /* cost_info */, "used_columns": [ "c" ] /* used_columns */, "attached_condition": "(<in_optimizer>(`test`.`t5`.`c`,<exists>(/* select#2 */ select 1 from `test`.`t1` join `test`.`t2` where ((`test`.`t1`.`c_key` = `test`.`t2`.`c_key`) and (<cache>(`test`.`t5`.`c`) = `test`.`t2`.`c`)))) and <in_optimizer>(`test`.`t5`.`c`,<exists>(/* select#3 */ select 1 from `test`.`t3` join `test`.`t4` where ((`test`.`t3`.`c_key` = `test`.`t4`.`c_key`) and (<cache>(`test`.`t5`.`c`) = `test`.`t4`.`c`)))))", "attached_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 3, "cost_info": { "query_cost": "3.81" } /* cost_info */, "nested_loop": [ { "table": { "table_name": "t4", "access_type": "ALL", "rows_examined_per_scan": 3, "rows_produced_per_join": 1, "filtered": "33.33", "cost_info": { "read_cost": "2.01", "eval_cost": "0.20", "prefix_cost": "2.61", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "c", "c_key" ] /* used_columns */, "attached_condition": "((<cache>(`test`.`t5`.`c`) = `test`.`t4`.`c`) and (`test`.`t4`.`c_key` is not null))" } /* table */ }, { "table": { "table_name": "t3", "access_type": "ref", "possible_keys": [ "c_key" ] /* possible_keys */, "key": "c_key", "used_key_parts": [ "c_key" ] /* used_key_parts */, "key_length": "5", "ref": [ "test.t4.c_key" ] /* ref */, "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "using_index": true, "cost_info": { "read_cost": "1.00", "eval_cost": "0.20", "prefix_cost": "3.81", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "c_key" ] /* used_columns */ } /* table */ } ] /* nested_loop */ } /* query_block */ }, { "dependent": true, "cacheable": false, "query_block": { "select_id": 2, "cost_info": { "query_cost": "4.03" } /* cost_info */, "nested_loop": [ { "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 3, "rows_produced_per_join": 1, "filtered": "33.33", "cost_info": { "read_cost": "2.01", "eval_cost": "0.20", "prefix_cost": "2.61", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "c", "c_key" ] /* used_columns */, "attached_condition": "((<cache>(`test`.`t5`.`c`) = `test`.`t2`.`c`) and (`test`.`t2`.`c_key` is not null))" } /* table */ }, { "table": { "table_name": "t1", "access_type": "ref", "possible_keys": [ "c_key" ] /* possible_keys */, "key": "c_key", "used_key_parts": [ "c_key" ] /* used_key_parts */, "key_length": "5", "ref": [ "test.t2.c_key" ] /* ref */, "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "using_index": true, "cost_info": { "read_cost": "1.02", "eval_cost": "0.40", "prefix_cost": "4.03", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "c_key" ] /* used_columns */ } /* table */ } ] /* nested_loop */ } /* query_block */ } ] /* attached_subqueries */ } /* table */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select `test`.`t5`.`c` AS `c` from `test`.`t5` where (<in_optimizer>(`test`.`t5`.`c`,<exists>(/* select#2 */ select 1 from `test`.`t1` join `test`.`t2` where ((`test`.`t1`.`c_key` = `test`.`t2`.`c_key`) and (<cache>(`test`.`t5`.`c`) = `test`.`t2`.`c`)))) and <in_optimizer>(`test`.`t5`.`c`,<exists>(/* select#3 */ select 1 from `test`.`t3` join `test`.`t4` where ((`test`.`t3`.`c_key` = `test`.`t4`.`c_key`) and (<cache>(`test`.`t5`.`c`) = `test`.`t4`.`c`))))) DROP TABLE t1, t2, t3, t4, t5; CREATE TABLE t1 (i INT); CREATE TABLE t2 (i INT); CREATE TABLE t3 (i INT); INSERT INTO t1 VALUES (1); INSERT INTO t2 VALUES (1); INSERT INTO t3 VALUES (1); # Subqueries in UPDATE values list EXPLAIN UPDATE t1 SET i=(SELECT i 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 1 100.00 NULL 2 SUBQUERY t2 NULL system NULL NULL NULL NULL 1 100.00 NULL EXPLAIN FORMAT=JSON UPDATE t1 SET i=(SELECT i FROM t2); EXPLAIN { "query_block": { "select_id": 1, "table": { "update": true, "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 1, "filtered": "100.00" } /* table */, "update_value_subqueries": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 2, "cost_info": { "query_cost": "1.00" } /* cost_info */, "table": { "table_name": "t2", "access_type": "system", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "0.00", "eval_cost": "0.20", "prefix_cost": "0.00", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* query_block */ } ] /* update_value_subqueries */ } /* query_block */ } EXPLAIN UPDATE t1, t2 SET t1.i=(SELECT i FROM t3); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 UPDATE t1 NULL system NULL NULL NULL NULL 1 100.00 NULL 1 PRIMARY t2 NULL system NULL NULL NULL NULL 1 100.00 NULL 2 SUBQUERY t3 NULL system NULL NULL NULL NULL 1 100.00 NULL EXPLAIN FORMAT=JSON UPDATE t1, t2 SET t1.i=(SELECT i FROM t3); EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "1.00" } /* cost_info */, "nested_loop": [ { "table": { "update": true, "table_name": "t1", "access_type": "system", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "0.00", "eval_cost": "0.20", "prefix_cost": "0.00", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ }, { "table": { "table_name": "t2", "access_type": "system", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "0.00", "eval_cost": "0.20", "prefix_cost": "0.00", "data_read_per_join": "8" } /* cost_info */ } /* table */ } ] /* nested_loop */, "update_value_subqueries": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 2, "cost_info": { "query_cost": "1.00" } /* cost_info */, "table": { "table_name": "t3", "access_type": "system", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "0.00", "eval_cost": "0.20", "prefix_cost": "0.00", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* query_block */ } ] /* update_value_subqueries */ } /* query_block */ } # INSERT ... ON DUPLICATE KEY UPDATE x=(SELECT ...) value list EXPLAIN INSERT INTO t1 (i) SELECT i FROM t2 ON DUPLICATE KEY UPDATE i=(SELECT i FROM t2); 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 1 PRIMARY t2 NULL system NULL NULL NULL NULL 1 100.00 NULL 2 SUBQUERY t2 NULL system NULL NULL NULL NULL 1 100.00 NULL EXPLAIN FORMAT=JSON INSERT INTO t1 (i) SELECT i FROM t2 ON DUPLICATE KEY UPDATE i=(SELECT i FROM t2); EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "1.00" } /* cost_info */, "table": { "insert": true, "table_name": "t1", "access_type": "ALL" } /* table */, "insert_from": { "table": { "table_name": "t2", "access_type": "system", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "0.00", "eval_cost": "0.20", "prefix_cost": "0.00", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* insert_from */, "update_value_subqueries": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 2, "cost_info": { "query_cost": "1.00" } /* cost_info */, "table": { "table_name": "t2", "access_type": "system", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "0.00", "eval_cost": "0.20", "prefix_cost": "0.00", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* query_block */ } ] /* update_value_subqueries */ } /* query_block */ } EXPLAIN INSERT INTO t1 VALUES (1) ON DUPLICATE KEY UPDATE i = (SELECT i FROM t2); 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 2 SUBQUERY t2 NULL system NULL NULL NULL NULL 1 100.00 NULL EXPLAIN FORMAT=JSON INSERT INTO t1 VALUES (1) ON DUPLICATE KEY UPDATE i = (SELECT i FROM t2); EXPLAIN { "query_block": { "select_id": 1, "table": { "insert": true, "table_name": "t1", "access_type": "ALL" } /* table */, "update_value_subqueries": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 2, "cost_info": { "query_cost": "1.00" } /* cost_info */, "table": { "table_name": "t2", "access_type": "system", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "0.00", "eval_cost": "0.20", "prefix_cost": "0.00", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* query_block */ } ] /* update_value_subqueries */ } /* query_block */ } # Subqueries in INSERT VALUES tuples: EXPLAIN INSERT INTO t3 VALUES((SELECT i FROM t1)), ((SELECT i FROM t2)); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 INSERT t3 NULL ALL NULL NULL NULL NULL NULL NULL NULL 3 SUBQUERY t2 NULL system NULL NULL NULL NULL 1 100.00 NULL 2 SUBQUERY t1 NULL system NULL NULL NULL NULL 1 100.00 NULL EXPLAIN FORMAT=JSON INSERT INTO t3 VALUES((SELECT i FROM t1)), ((SELECT i FROM t2)); EXPLAIN { "query_block": { "select_id": 1, "table": { "insert": true, "table_name": "t3", "access_type": "ALL" } /* table */, "optimized_away_subqueries": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 3, "cost_info": { "query_cost": "1.00" } /* cost_info */, "table": { "table_name": "t2", "access_type": "system", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "0.00", "eval_cost": "0.20", "prefix_cost": "0.00", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* query_block */ }, { "dependent": false, "cacheable": true, "query_block": { "select_id": 2, "cost_info": { "query_cost": "1.00" } /* cost_info */, "table": { "table_name": "t1", "access_type": "system", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "0.00", "eval_cost": "0.20", "prefix_cost": "0.00", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */ } /* query_block */ } ] /* optimized_away_subqueries */ } /* query_block */ } DROP TABLE t1, t2, t3; # Various queries EXPLAIN SELECT a, b FROM (SELECT 1 AS a, 2 AS b UNION ALL SELECT 1 AS a, 2 AS b) t1 GROUP BY a ORDER BY b DESC; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY <derived2> NULL ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort 2 DERIVED NULL NULL NULL NULL NULL NULL NULL NULL NULL No tables used 3 UNION NULL NULL NULL NULL NULL NULL NULL NULL NULL No tables used Warnings: Note 1003 /* select#1 */ select `t1`.`a` AS `a`,`t1`.`b` AS `b` from (/* select#2 */ select 1 AS `a`,2 AS `b` union all /* select#3 */ select 1 AS `a`,2 AS `b`) `t1` group by `t1`.`a` order by `t1`.`b` desc EXPLAIN FORMAT=JSON SELECT a, b FROM (SELECT 1 AS a, 2 AS b UNION ALL SELECT 1 AS a, 2 AS b) t1 GROUP BY a ORDER BY b DESC; EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "10.50" } /* cost_info */, "ordering_operation": { "using_filesort": true, "grouping_operation": { "using_temporary_table": true, "using_filesort": false, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "10.10", "eval_cost": "0.40", "prefix_cost": "10.50", "data_read_per_join": "48" } /* cost_info */, "used_columns": [ "a", "b" ] /* used_columns */, "materialized_from_subquery": { "using_temporary_table": true, "dependent": false, "cacheable": true, "query_block": { "union_result": { "using_temporary_table": false, "query_specifications": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 2, "message": "No tables used" } /* query_block */ }, { "dependent": false, "cacheable": true, "query_block": { "select_id": 3, "message": "No tables used" } /* query_block */ } ] /* query_specifications */ } /* union_result */ } /* query_block */ } /* materialized_from_subquery */ } /* table */ } /* grouping_operation */ } /* ordering_operation */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select `t1`.`a` AS `a`,`t1`.`b` AS `b` from (/* select#2 */ select 1 AS `a`,2 AS `b` union all /* select#3 */ select 1 AS `a`,2 AS `b`) `t1` group by `t1`.`a` order by `t1`.`b` desc # CREATE TABLE t1(a INT, b INT); INSERT INTO t1 VALUES (), (); EXPLAIN SELECT 1 FROM t1 GROUP BY GREATEST(t1.a, (SELECT 1 FROM (SELECT t1.b FROM t1, t1 t2 ORDER BY t1.a, t1.a LIMIT 1) AS d)); 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 Using temporary; Using filesort 2 SUBQUERY <derived3> NULL system NULL NULL NULL NULL 1 100.00 NULL 3 DERIVED t1 NULL ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort 3 DERIVED t2 NULL ALL NULL NULL NULL NULL 2 100.00 Using join buffer (Block Nested Loop) Warnings: Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` group by greatest(`test`.`t1`.`a`,(/* select#2 */ select 1 from dual)) EXPLAIN FORMAT=JSON SELECT 1 FROM t1 GROUP BY GREATEST(t1.a, (SELECT 1 FROM (SELECT t1.b FROM t1, t1 t2 ORDER BY t1.a, t1.a LIMIT 1) AS d)); EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "4.40" } /* cost_info */, "grouping_operation": { "using_temporary_table": true, "using_filesort": true, "cost_info": { "sort_cost": "2.00" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "32" } /* cost_info */, "used_columns": [ "a" ] /* used_columns */ } /* table */, "group_by_subqueries": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 2, "cost_info": { "query_cost": "1.00" } /* cost_info */, "table": { "table_name": "d", "access_type": "system", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "0.00", "eval_cost": "0.20", "prefix_cost": "0.00", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "b" ] /* used_columns */, "materialized_from_subquery": { "using_temporary_table": true, "dependent": false, "cacheable": true, "query_block": { "select_id": 3, "cost_info": { "query_cost": "5.21" } /* cost_info */, "ordering_operation": { "using_temporary_table": true, "using_filesort": true, "nested_loop": [ { "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "32" } /* cost_info */, "used_columns": [ "a", "b" ] /* used_columns */ } /* table */ }, { "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 4, "filtered": "100.00", "using_join_buffer": "Block Nested Loop", "cost_info": { "read_cost": "2.00", "eval_cost": "0.80", "prefix_cost": "5.21", "data_read_per_join": "64" } /* cost_info */ } /* table */ } ] /* nested_loop */ } /* ordering_operation */ } /* query_block */ } /* materialized_from_subquery */ } /* table */ } /* query_block */ } ] /* group_by_subqueries */ } /* grouping_operation */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` group by greatest(`test`.`t1`.`a`,(/* select#2 */ select 1 from dual)) DROP TABLE t1; # CREATE TABLE t1(f1 INT); INSERT INTO t1 VALUES (1),(1); EXPLAIN SELECT 1 FROM t1 WHERE (SELECT (SELECT 1 FROM t1 GROUP BY f1)); 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 3 SUBQUERY t1 NULL ALL NULL NULL NULL NULL 2 100.00 Using temporary; Using filesort Warnings: Note 1249 Select 2 was reduced during optimization Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` where 1 EXPLAIN FORMAT=JSON SELECT 1 FROM t1 WHERE (SELECT (SELECT 1 FROM t1 GROUP BY f1)); EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "2.40" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */ } /* table */, "optimized_away_subqueries": [ { "dependent": false, "cacheable": true, "query_block": { "select_id": 3, "cost_info": { "query_cost": "4.40" } /* cost_info */, "grouping_operation": { "using_temporary_table": true, "using_filesort": true, "cost_info": { "sort_cost": "2.00" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "f1" ] /* used_columns */ } /* table */ } /* grouping_operation */ } /* query_block */ } ] /* optimized_away_subqueries */ } /* query_block */ } Warnings: Note 1249 Select 2 was reduced during optimization Note 1003 /* select#1 */ select 1 AS `1` from `test`.`t1` where 1 DROP TABLE t1; # CREATE TABLE t1 (i INT); CREATE TABLE t2 (i INT, j INT); INSERT INTO t1 VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9), (10); INSERT INTO t2 SELECT i, i * 10 FROM t1; EXPLAIN SELECT * FROM t1 ORDER BY (SELECT t2.j FROM t2 WHERE t2.i = t1.i); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 10 100.00 Using filesort 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 10 10.00 Using where Warnings: Note 1276 Field or reference 'test.t1.i' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` order by (/* select#2 */ select `test`.`t2`.`j` from `test`.`t2` where (`test`.`t2`.`i` = `test`.`t1`.`i`)) EXPLAIN FORMAT=JSON SELECT * FROM t1 ORDER BY (SELECT t2.j FROM t2 WHERE t2.i = t1.i); EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "4.02" } /* cost_info */, "ordering_operation": { "using_filesort": true, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 10, "rows_produced_per_join": 10, "filtered": "100.00", "cost_info": { "read_cost": "2.02", "eval_cost": "2.00", "prefix_cost": "4.02", "data_read_per_join": "80" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */, "order_by_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 2, "cost_info": { "query_cost": "4.02" } /* cost_info */, "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 10, "rows_produced_per_join": 1, "filtered": "10.00", "cost_info": { "read_cost": "2.02", "eval_cost": "0.20", "prefix_cost": "4.02", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "i", "j" ] /* used_columns */, "attached_condition": "(`test`.`t2`.`i` = `test`.`t1`.`i`)" } /* table */ } /* query_block */ } ] /* order_by_subqueries */ } /* ordering_operation */ } /* query_block */ } Warnings: Note 1276 Field or reference 'test.t1.i' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` order by (/* select#2 */ select `test`.`t2`.`j` from `test`.`t2` where (`test`.`t2`.`i` = `test`.`t1`.`i`)) EXPLAIN SELECT * FROM t1 GROUP BY (SELECT t2.j FROM t2 WHERE t2.i = t1.i); id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 PRIMARY t1 NULL ALL NULL NULL NULL NULL 10 100.00 Using temporary; Using filesort 2 DEPENDENT SUBQUERY t2 NULL ALL NULL NULL NULL NULL 10 10.00 Using where Warnings: Note 1276 Field or reference 'test.t1.i' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` group by (/* select#2 */ select `test`.`t2`.`j` from `test`.`t2` where (`test`.`t2`.`i` = `test`.`t1`.`i`)) EXPLAIN FORMAT=JSON SELECT * FROM t1 GROUP BY (SELECT t2.j FROM t2 WHERE t2.i = t1.i); EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "4.02" } /* cost_info */, "grouping_operation": { "using_temporary_table": true, "using_filesort": true, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 10, "rows_produced_per_join": 10, "filtered": "100.00", "cost_info": { "read_cost": "2.02", "eval_cost": "2.00", "prefix_cost": "4.02", "data_read_per_join": "80" } /* cost_info */, "used_columns": [ "i" ] /* used_columns */ } /* table */, "group_by_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 2, "cost_info": { "query_cost": "4.02" } /* cost_info */, "table": { "table_name": "t2", "access_type": "ALL", "rows_examined_per_scan": 10, "rows_produced_per_join": 1, "filtered": "10.00", "cost_info": { "read_cost": "2.02", "eval_cost": "0.20", "prefix_cost": "4.02", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "i", "j" ] /* used_columns */, "attached_condition": "(`test`.`t2`.`i` = `test`.`t1`.`i`)" } /* table */ } /* query_block */ } ] /* group_by_subqueries */ } /* grouping_operation */ } /* query_block */ } Warnings: Note 1276 Field or reference 'test.t1.i' of SELECT #2 was resolved in SELECT #1 Note 1003 /* select#1 */ select `test`.`t1`.`i` AS `i` from `test`.`t1` group by (/* select#2 */ select `test`.`t2`.`j` from `test`.`t2` where (`test`.`t2`.`i` = `test`.`t1`.`i`)) DROP TABLE t1, t2; CREATE TABLE t1 (a INT NOT NULL, b INT NOT NULL, KEY k1 (a, b)); INSERT INTO t1 VALUES (10,1),(10,2),(10,3),(20,4),(20,5),(20,6), (30,7),(30,8),(30,9),(40,10),(40,11),(40,12),(40,13), (40,14),(40,15),(40,16),(40,17),(40,18),(40,19),(40,20); EXPLAIN FORMAT=JSON SELECT a, MIN(b) AS b FROM t1 GROUP BY a ORDER BY b; EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "6.50" } /* cost_info */, "ordering_operation": { "using_temporary_table": true, "using_filesort": true, "grouping_operation": { "using_filesort": false, "table": { "table_name": "t1", "access_type": "range", "possible_keys": [ "k1" ] /* possible_keys */, "key": "k1", "used_key_parts": [ "a" ] /* used_key_parts */, "key_length": "4", "rows_examined_per_scan": 11, "rows_produced_per_join": 11, "filtered": "100.00", "using_index_for_group_by": true, "cost_info": { "read_cost": "4.30", "eval_cost": "2.20", "prefix_cost": "6.50", "data_read_per_join": "176" } /* cost_info */, "used_columns": [ "a", "b" ] /* used_columns */ } /* table */ } /* grouping_operation */ } /* ordering_operation */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,min(`test`.`t1`.`b`) AS `b` from `test`.`t1` group by `test`.`t1`.`a` order by `b` DROP TABLE t1; # CREATE TABLE t1 (a INT NOT NULL, b CHAR(3) NOT NULL, PRIMARY KEY (a)); INSERT INTO t1 VALUES (1,'ABC'), (2,'EFG'), (3,'HIJ'); CREATE TABLE t2 (a INT NOT NULL,b CHAR(3) NOT NULL,PRIMARY KEY (a, b)); INSERT INTO t2 VALUES (1,'a'),(1,'b'),(3,'F'); EXPLAIN FORMAT=JSON SELECT t1.a, GROUP_CONCAT(t2.b) AS b FROM t1 LEFT JOIN t2 ON t1.a=t2.a GROUP BY t1.a ORDER BY t1.b; EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "6.20" } /* cost_info */, "ordering_operation": { "using_temporary_table": true, "using_filesort": true, "grouping_operation": { "using_filesort": true, "nested_loop": [ { "table": { "table_name": "t1", "access_type": "ALL", "possible_keys": [ "PRIMARY" ] /* possible_keys */, "rows_examined_per_scan": 3, "rows_produced_per_join": 3, "filtered": "100.00", "cost_info": { "read_cost": "2.01", "eval_cost": "0.60", "prefix_cost": "2.61", "data_read_per_join": "48" } /* cost_info */, "used_columns": [ "a", "b" ] /* used_columns */ } /* table */ }, { "table": { "table_name": "t2", "access_type": "ref", "possible_keys": [ "PRIMARY" ] /* possible_keys */, "key": "PRIMARY", "used_key_parts": [ "a" ] /* used_key_parts */, "key_length": "4", "ref": [ "test.t1.a" ] /* ref */, "rows_examined_per_scan": 1, "rows_produced_per_join": 3, "filtered": "100.00", "using_index": true, "cost_info": { "read_cost": "3.00", "eval_cost": "0.60", "prefix_cost": "6.21", "data_read_per_join": "48" } /* cost_info */, "used_columns": [ "a", "b" ] /* used_columns */ } /* table */ } ] /* nested_loop */ } /* grouping_operation */ } /* ordering_operation */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select `test`.`t1`.`a` AS `a`,group_concat(`test`.`t2`.`b` separator ',') AS `b` from `test`.`t1` left join `test`.`t2` on((`test`.`t2`.`a` = `test`.`t1`.`a`)) where 1 group by `test`.`t1`.`a` order by `test`.`t1`.`b` DROP TABLE t1; DROP TABLE t2; # CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 VALUES (1,4), (2,2), (2,2), (4,1), (4,1), (4,1), (4,1), (2,1), (2,1); EXPLAIN FORMAT=JSON SELECT SUM(b) FROM t1 GROUP BY a WITH ROLLUP; EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "12.82" } /* cost_info */, "grouping_operation": { "using_filesort": true, "cost_info": { "sort_cost": "9.00" } /* cost_info */, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 9, "rows_produced_per_join": 9, "filtered": "100.00", "cost_info": { "read_cost": "2.02", "eval_cost": "1.80", "prefix_cost": "3.82", "data_read_per_join": "144" } /* cost_info */, "used_columns": [ "a", "b" ] /* used_columns */ } /* table */ } /* grouping_operation */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select sum(`test`.`t1`.`b`) AS `SUM(b)` from `test`.`t1` group by `test`.`t1`.`a` with rollup DROP TABLE t1; # Composition of DISTINCT, GROUP BY and ORDER BY CREATE TABLE t1 (a INT, b INT); INSERT INTO t1 VALUES (1, 1), (1, 2), (2, 1), (2, 2), (3, 1); EXPLAIN FORMAT=JSON SELECT DISTINCT SUM(b) s FROM t1 GROUP BY a ORDER BY s; EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "3.01" } /* cost_info */, "ordering_operation": { "using_filesort": true, "duplicates_removal": { "using_temporary_table": true, "using_filesort": false, "grouping_operation": { "using_temporary_table": true, "using_filesort": false, "table": { "table_name": "t1", "access_type": "ALL", "rows_examined_per_scan": 5, "rows_produced_per_join": 5, "filtered": "100.00", "cost_info": { "read_cost": "2.01", "eval_cost": "1.00", "prefix_cost": "3.01", "data_read_per_join": "80" } /* cost_info */, "used_columns": [ "a", "b" ] /* used_columns */ } /* table */ } /* grouping_operation */ } /* duplicates_removal */ } /* ordering_operation */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select distinct sum(`test`.`t1`.`b`) AS `s` from `test`.`t1` group by `test`.`t1`.`a` order by `s` FLUSH STATUS; SELECT DISTINCT SUM(b) s FROM t1 GROUP BY a ORDER BY s; s 1 3 SHOW SESSION STATUS WHERE (Variable_name LIKE 'Sort_%' OR Variable_name LIKE 'Created_%_tables') AND Value > 0; Variable_name Value Created_tmp_tables 1 Sort_rows 2 Sort_scan 1 DROP TABLE t1; # "buffer_result" node CREATE TABLE t1 (a INT NOT NULL); CREATE TABLE t2 (a INT NOT NULL, PRIMARY KEY (a)); INSERT INTO t1 VALUES (1); INSERT INTO t2 VALUES (1),(2); EXPLAIN FORMAT=JSON SELECT SQL_BIG_RESULT DISTINCT t1.a FROM t1,t2 ORDER BY t2.a; EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "2.40" } /* cost_info */, "ordering_operation": { "using_filesort": false, "duplicates_removal": { "using_temporary_table": true, "using_filesort": false, "buffer_result": { "using_temporary_table": true, "nested_loop": [ { "table": { "table_name": "t1", "access_type": "system", "rows_examined_per_scan": 1, "rows_produced_per_join": 1, "filtered": "100.00", "cost_info": { "read_cost": "0.00", "eval_cost": "0.20", "prefix_cost": "0.00", "data_read_per_join": "8" } /* cost_info */, "used_columns": [ "a" ] /* used_columns */ } /* table */ }, { "table": { "table_name": "t2", "access_type": "index", "key": "PRIMARY", "used_key_parts": [ "a" ] /* used_key_parts */, "key_length": "4", "rows_examined_per_scan": 2, "rows_produced_per_join": 2, "filtered": "100.00", "using_index": true, "distinct": true, "cost_info": { "read_cost": "2.00", "eval_cost": "0.40", "prefix_cost": "2.40", "data_read_per_join": "16" } /* cost_info */, "used_columns": [ "a" ] /* used_columns */ } /* table */ } ] /* nested_loop */ } /* buffer_result */ } /* duplicates_removal */ } /* ordering_operation */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select distinct sql_big_result '1' AS `a` from `test`.`t2` order by `test`.`t2`.`a` DROP TABLE t1, t2; # CREATE TABLE t1 (a INT NOT NULL, b INT, PRIMARY KEY (a)); CREATE TABLE t2 (a INT NOT NULL, PRIMARY KEY (a)); INSERT INTO t1 VALUES (1,10), (2,20), (3,30), (4,40); INSERT INTO t2 VALUES (2), (3), (4), (5); EXPLAIN FORMAT=JSON SELECT * FROM t2 WHERE t2.a IN (SELECT a FROM t1 WHERE t1.b <> 30); EXPLAIN { "query_block": { "select_id": 1, "cost_info": { "query_cost": "2.81" } /* cost_info */, "table": { "table_name": "t2", "access_type": "index", "key": "PRIMARY", "used_key_parts": [ "a" ] /* used_key_parts */, "key_length": "4", "rows_examined_per_scan": 4, "rows_produced_per_join": 4, "filtered": "100.00", "using_index": true, "cost_info": { "read_cost": "2.01", "eval_cost": "0.80", "prefix_cost": "2.81", "data_read_per_join": "32" } /* cost_info */, "used_columns": [ "a" ] /* used_columns */, "attached_condition": "<in_optimizer>(`test`.`t2`.`a`,<exists>(<primary_index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on PRIMARY where ((`test`.`t1`.`b` <> 30) and (<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`)))))", "attached_subqueries": [ { "dependent": true, "cacheable": false, "query_block": { "select_id": 2, "cost_info": { "query_cost": "1.20" } /* cost_info */, "table": { "table_name": "t1", "access_type": "unique_subquery", "possible_keys": [ "PRIMARY" ] /* possible_keys */, "key": "PRIMARY", "used_key_parts": [ "a" ] /* used_key_parts */, "key_length": "4", "ref": [ "func" ] /* ref */, "rows_examined_per_scan": 1, "rows_produced_per_join": 0, "filtered": "75.00", "cost_info": { "read_cost": "1.00", "eval_cost": "0.15", "prefix_cost": "1.20", "data_read_per_join": "12" } /* cost_info */, "used_columns": [ "a", "b" ] /* used_columns */, "attached_condition": "((`test`.`t1`.`b` <> 30) and (<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`))" } /* table */ } /* query_block */ } ] /* attached_subqueries */ } /* table */ } /* query_block */ } Warnings: Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a` from `test`.`t2` where <in_optimizer>(`test`.`t2`.`a`,<exists>(<primary_index_lookup>(<cache>(`test`.`t2`.`a`) in t1 on PRIMARY where ((`test`.`t1`.`b` <> 30) and (<cache>(`test`.`t2`.`a`) = `test`.`t1`.`a`))))) DROP TABLE t1, t2; set default_storage_engine= @save_storage_engine; set optimizer_switch=default;
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