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set optimizer_switch='index_condition_pushdown=on,mrr=on,mrr_cost_based=off'; drop table if exists t1, t2, t3; CREATE TABLE t1 ( event_date date DEFAULT '0000-00-00' NOT NULL, type int(11) DEFAULT '0' NOT NULL, event_id int(11) DEFAULT '0' NOT NULL, PRIMARY KEY (event_date,type,event_id) ); INSERT INTO t1 VALUES ('1999-07-10',100100,24), ('1999-07-11',100100,25), ('1999-07-13',100600,0), ('1999-07-13',100600,4), ('1999-07-13',100600,26), ('1999-07-14',100600,10), ('1999-07-15',100600,16), ('1999-07-15',100800,45), ('1999-07-15',101000,47), ('1999-07-16',100800,46), ('1999-07-20',100600,5), ('1999-07-20',100600,27), ('1999-07-21',100600,11), ('1999-07-22',100600,17), ('1999-07-23',100100,39), ('1999-07-24',100100,39), ('1999-07-24',100500,40), ('1999-07-25',100100,39), ('1999-07-27',100600,1), ('1999-07-27',100600,6), ('1999-07-27',100600,28), ('1999-07-28',100600,12), ('1999-07-29',100500,41), ('1999-07-29',100600,18), ('1999-07-30',100500,41), ('1999-07-31',100500,41), ('1999-08-01',100700,34), ('1999-08-03',100600,7), ('1999-08-03',100600,29), ('1999-08-04',100600,13), ('1999-08-05',100500,42), ('1999-08-05',100600,19), ('1999-08-06',100500,42), ('1999-08-07',100500,42), ('1999-08-08',100500,42), ('1999-08-10',100600,2), ('1999-08-10',100600,9), ('1999-08-10',100600,30), ('1999-08-11',100600,14), ('1999-08-12',100600,20), ('1999-08-17',100500,8), ('1999-08-17',100600,31), ('1999-08-18',100600,15), ('1999-08-19',100600,22), ('1999-08-24',100600,3), ('1999-08-24',100600,32), ('1999-08-27',100500,43), ('1999-08-31',100600,33), ('1999-09-17',100100,37), ('1999-09-18',100100,37), ('1999-09-19',100100,37), ('2000-12-18',100700,38); select event_date,type,event_id from t1 WHERE event_date >= "1999-07-01" AND event_date < "1999-07-15" AND (type=100600 OR type=100100) ORDER BY event_date; event_date type event_id 1999-07-10 100100 24 1999-07-11 100100 25 1999-07-13 100600 0 1999-07-13 100600 4 1999-07-13 100600 26 1999-07-14 100600 10 explain select event_date,type,event_id from t1 WHERE type = 100601 and event_date >= "1999-07-01" AND event_date < "1999-07-15" AND (type=100600 OR type=100100) ORDER BY event_date; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE select event_date,type,event_id from t1 WHERE event_date >= "1999-07-01" AND event_date <= "1999-07-15" AND (type=100600 OR type=100100) or event_date >= "1999-07-01" AND event_date <= "1999-07-15" AND type=100099; event_date type event_id 1999-07-10 100100 24 1999-07-11 100100 25 1999-07-13 100600 0 1999-07-13 100600 4 1999-07-13 100600 26 1999-07-14 100600 10 1999-07-15 100600 16 drop table t1; CREATE TABLE t1 ( PAPER_ID smallint(6) DEFAULT '0' NOT NULL, YEAR smallint(6) DEFAULT '0' NOT NULL, ISSUE smallint(6) DEFAULT '0' NOT NULL, CLOSED tinyint(4) DEFAULT '0' NOT NULL, ISS_DATE date DEFAULT '0000-00-00' NOT NULL, PRIMARY KEY (PAPER_ID,YEAR,ISSUE) ); INSERT INTO t1 VALUES (3,1999,34,0,'1999-07-12'), (1,1999,111,0,'1999-03-23'), (1,1999,222,0,'1999-03-23'), (3,1999,33,0,'1999-07-12'), (3,1999,32,0,'1999-07-12'), (3,1999,31,0,'1999-07-12'), (3,1999,30,0,'1999-07-12'), (3,1999,29,0,'1999-07-12'), (3,1999,28,0,'1999-07-12'), (1,1999,40,1,'1999-05-01'), (1,1999,41,1,'1999-05-01'), (1,1999,42,1,'1999-05-01'), (1,1999,46,1,'1999-05-01'), (1,1999,47,1,'1999-05-01'), (1,1999,48,1,'1999-05-01'), (1,1999,49,1,'1999-05-01'), (1,1999,50,0,'1999-05-01'), (1,1999,51,0,'1999-05-01'), (1,1999,200,0,'1999-06-28'), (1,1999,52,0,'1999-06-28'), (1,1999,53,0,'1999-06-28'), (1,1999,54,0,'1999-06-28'), (1,1999,55,0,'1999-06-28'), (1,1999,56,0,'1999-07-01'), (1,1999,57,0,'1999-07-01'), (1,1999,58,0,'1999-07-01'), (1,1999,59,0,'1999-07-01'), (1,1999,60,0,'1999-07-01'), (3,1999,35,0,'1999-07-12'); select YEAR,ISSUE from t1 where PAPER_ID=3 and (YEAR>1999 or (YEAR=1999 and ISSUE>28)) order by YEAR,ISSUE; YEAR ISSUE 1999 29 1999 30 1999 31 1999 32 1999 33 1999 34 1999 35 check table t1; Table Op Msg_type Msg_text test.t1 check status OK repair table t1; Table Op Msg_type Msg_text test.t1 repair status OK drop table t1; CREATE TABLE t1 ( id int(11) NOT NULL auto_increment, parent_id int(11) DEFAULT '0' NOT NULL, level tinyint(4) DEFAULT '0' NOT NULL, PRIMARY KEY (id), KEY parent_id (parent_id), KEY level (level) ); INSERT INTO t1 VALUES (1,0,0), (3,1,1), (4,1,1), (8,2,2), (9,2,2), (17,3,2), (22,4,2), (24,4,2), (28,5,2), (29,5,2), (30,5,2), (31,6,2), (32,6,2), (33,6,2), (203,7,2), (202,7,2), (20,3,2), (157,0,0), (193,5,2), (40,7,2), (2,1,1), (15,2,2), (6,1,1), (34,6,2), (35,6,2), (16,3,2), (7,1,1), (36,7,2), (18,3,2), (26,5,2), (27,5,2), (183,4,2), (38,7,2), (25,5,2), (37,7,2), (21,4,2), (19,3,2), (5,1,1), (179,5,2); SELECT * FROM t1 WHERE level = 1 AND parent_id = 1; id parent_id level 3 1 1 4 1 1 2 1 1 6 1 1 7 1 1 5 1 1 SELECT * FROM t1 WHERE level = 1 AND parent_id = 1 order by id; id parent_id level 2 1 1 3 1 1 4 1 1 5 1 1 6 1 1 7 1 1 drop table t1; create table t1( Satellite varchar(25) not null, SensorMode varchar(25) not null, FullImageCornersUpperLeftLongitude double not null, FullImageCornersUpperRightLongitude double not null, FullImageCornersUpperRightLatitude double not null, FullImageCornersLowerRightLatitude double not null, index two (Satellite, SensorMode, FullImageCornersUpperLeftLongitude, FullImageCornersUpperRightLongitude, FullImageCornersUpperRightLatitude, FullImageCornersLowerRightLatitude)); insert into t1 values("OV-3","PAN1",91,-92,40,50); insert into t1 values("OV-4","PAN1",91,-92,40,50); select * from t1 where t1.Satellite = "OV-3" and t1.SensorMode = "PAN1" and t1.FullImageCornersUpperLeftLongitude > -90.000000 and t1.FullImageCornersUpperRightLongitude < -82.000000; Satellite SensorMode FullImageCornersUpperLeftLongitude FullImageCornersUpperRightLongitude FullImageCornersUpperRightLatitude FullImageCornersLowerRightLatitude OV-3 PAN1 91 -92 40 50 drop table t1; create table t1 ( aString char(100) not null default "", key aString (aString(10)) ); insert t1 (aString) values ( "believe in myself" ), ( "believe" ), ("baaa" ), ( "believe in love"); select * from t1 where aString < "believe in myself" order by aString; aString baaa believe believe in love select * from t1 where aString > "believe in love" order by aString; aString believe in myself alter table t1 drop key aString; select * from t1 where aString < "believe in myself" order by aString; aString baaa believe believe in love select * from t1 where aString > "believe in love" order by aString; aString believe in myself drop table t1; CREATE TABLE t1 ( t1ID int(10) unsigned NOT NULL auto_increment, art binary(1) NOT NULL default '', KNR char(5) NOT NULL default '', RECHNR char(6) NOT NULL default '', POSNR char(2) NOT NULL default '', ARTNR char(10) NOT NULL default '', TEX char(70) NOT NULL default '', PRIMARY KEY (t1ID), KEY IdxArt (art), KEY IdxKnr (KNR), KEY IdxArtnr (ARTNR) ) ENGINE=MyISAM; INSERT INTO t1 (art) VALUES ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'),('j'),('J'), ('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'), ('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'), ('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'), ('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'), ('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'), ('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'), ('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'), ('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'), ('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'), ('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'), ('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'),('j'); select count(*) from t1 where upper(art) = 'J'; count(*) 213 select count(*) from t1 where art = 'J' or art = 'j'; count(*) 602 select count(*) from t1 where art = 'j' or art = 'J'; count(*) 602 select count(*) from t1 where art = 'j'; count(*) 389 select count(*) from t1 where art = 'J'; count(*) 213 drop table t1; create table t1 (x int, y int, index(x), index(y)); insert into t1 (x) values (1),(2),(3),(4),(5),(6),(7),(8),(9); update t1 set y=x; explain select * from t1, t1 t2 where t1.y = 8 and t2.x between 7 and t1.y+0; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref y y 5 const 1 NULL 1 SIMPLE t2 range x x 5 NULL 2 Using index condition; Using MRR; Using join buffer (Block Nested Loop) explain select * from t1, t1 t2 where t1.y = 8 and t2.x >= 7 and t2.x <= t1.y+0; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref y y 5 const 1 NULL 1 SIMPLE t2 range x x 5 NULL 2 Using index condition; Using MRR; Using join buffer (Block Nested Loop) explain select * from t1, t1 t2 where t1.y = 2 and t2.x between t1.y-1 and t1.y+1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref y y 5 const 1 NULL 1 SIMPLE t2 range x x 5 NULL 3 Using index condition; Using MRR; Using join buffer (Block Nested Loop) explain select * from t1, t1 t2 where t1.y = 2 and t2.x >= t1.y-1 and t2.x <= t1.y+1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref y y 5 const 1 NULL 1 SIMPLE t2 range x x 5 NULL 3 Using index condition; Using MRR; Using join buffer (Block Nested Loop) explain select * from t1, t1 t2 where t1.y = 2 and t2.x between 0 and t1.y; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref y y 5 const 1 NULL 1 SIMPLE t2 range x x 5 NULL 2 Using index condition; Using MRR; Using join buffer (Block Nested Loop) explain select * from t1, t1 t2 where t1.y = 2 and t2.x >= 0 and t2.x <= t1.y; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref y y 5 const 1 NULL 1 SIMPLE t2 range x x 5 NULL 2 Using index condition; Using MRR; Using join buffer (Block Nested Loop) explain select count(*) from t1 where x in (1); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref x x 5 const 1 Using index explain select count(*) from t1 where x in (1,2); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index x x 5 NULL 9 Using where; Using index drop table t1; CREATE TABLE t1 (key1 int(11) NOT NULL default '0', KEY i1 (key1)); INSERT INTO t1 VALUES (0),(0),(0),(0),(0),(1),(1); CREATE TABLE t2 (keya int(11) NOT NULL default '0', KEY j1 (keya)); INSERT INTO t2 VALUES (0),(0),(1),(1),(2),(2); explain select * from t1, t2 where (t1.key1 <t2.keya + 1) and t2.keya=3; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ref j1 j1 4 const 1 Using index 1 SIMPLE t1 index i1 i1 4 NULL 7 Using where; Using index; Using join buffer (Block Nested Loop) explain select * from t1 force index(i1), t2 force index(j1) where (t1.key1 <t2.keya + 1) and t2.keya=3; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ref j1 j1 4 const 1 Using index 1 SIMPLE t1 index i1 i1 4 NULL 7 Using where; Using index; Using join buffer (Block Nested Loop) DROP TABLE t1,t2; CREATE TABLE t1 ( a int(11) default NULL, b int(11) default NULL, KEY a (a), KEY b (b) ) ENGINE=MyISAM; INSERT INTO t1 VALUES (1,1),(2,1),(3,1),(4,1),(5,1),(6,1),(7,1),(8,1),(9,1),(10,2),(10,2), (13,2),(14,2),(15,2),(16,2),(17,3),(17,3),(16,3),(17,3),(19,3),(20,3), (21,4),(22,5),(23,5),(24,5),(25,5),(26,5),(30,5),(31,5),(32,5),(33,5), (33,5),(33,5),(33,5),(33,5),(34,5),(35,5); EXPLAIN SELECT * FROM t1 WHERE a IN(1,2) AND b=5; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a,b a 5 NULL 2 Using index condition; Using where; Using MRR SELECT * FROM t1 WHERE a IN(1,2) AND b=5; a b DROP TABLE t1; CREATE TABLE t1 (a int, b int, c int, INDEX (c,a,b)); INSERT INTO t1 VALUES (1,0,0),(1,0,0),(1,0,0); INSERT INTO t1 VALUES (0,1,0),(0,1,0),(0,1,0); SELECT COUNT(*) FROM t1 WHERE (c=0 and a=1) or (c=0 and b=1); COUNT(*) 6 SELECT COUNT(*) FROM t1 WHERE (c=0 and b=1) or (c=0 and a=1); COUNT(*) 6 DROP TABLE t1; CREATE TABLE t1 ( a int not null, b int not null, INDEX ab(a,b) ); INSERT INTO t1 VALUES (47,1), (70,1), (15,1), (15, 4); SELECT * FROM t1 WHERE ( ( b =1 AND a BETWEEN 14 AND 21 ) OR ( b =2 AND a BETWEEN 16 AND 18 ) OR ( b =3 AND a BETWEEN 15 AND 19 ) OR (a BETWEEN 19 AND 47) ); a b 15 1 47 1 DROP TABLE t1; CREATE TABLE t1 ( id int( 11 ) unsigned NOT NULL AUTO_INCREMENT , line int( 5 ) unsigned NOT NULL default '0', columnid int( 3 ) unsigned NOT NULL default '0', owner int( 3 ) unsigned NOT NULL default '0', ordinal int( 3 ) unsigned NOT NULL default '0', showid smallint( 6 ) unsigned NOT NULL default '1', tableid int( 1 ) unsigned NOT NULL default '1', content int( 5 ) unsigned NOT NULL default '188', PRIMARY KEY ( owner, id ) , KEY menu( owner, showid, columnid ) , KEY `COLUMN` ( owner, columnid, line ) , KEY `LINES` ( owner, tableid, content, id ) , KEY recount( owner, line ) ) ENGINE = MYISAM; INSERT into t1 (owner,id,columnid,line) values (11,15,15,1),(11,13,13,5); SELECT id, columnid, tableid, content, showid, line, ordinal FROM t1 WHERE owner=11 AND ((columnid IN ( 15, 13, 14 ) AND line IN ( 1, 2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 31 )) OR (columnid IN ( 13, 14 ) AND line IN ( 15 ))) LIMIT 0 , 30; id columnid tableid content showid line ordinal 13 13 1 188 1 5 0 15 15 1 188 1 1 0 drop table t1; create table t1 (id int(10) primary key); insert into t1 values (1),(2),(3),(4),(5),(6),(7),(8),(9); select id from t1 where id in (2,5,9) ; id 2 5 9 select id from t1 where id=2 or id=5 or id=9 ; id 2 5 9 drop table t1; create table t1 ( id1 int not null, id2 int not null, idnull int null, c char(20), primary key (id1,id2)); insert into t1 values (0,1,NULL,"aaa"), (1,1,NULL,"aaa"), (2,1,NULL,"aaa"), (3,1,NULL,"aaa"), (4,1,NULL,"aaa"), (5,1,NULL,"aaa"), (6,1,NULL,"aaa"), (7,1,NULL,"aaa"), (8,1,NULL,"aaa"), (9,1,NULL,"aaa"), (10,1,NULL,"aaa"), (11,1,NULL,"aaa"), (12,1,NULL,"aaa"), (13,1,NULL,"aaa"), (14,1,NULL,"aaa"), (15,1,NULL,"aaa"), (16,1,NULL,"aaa"), (17,1,NULL,"aaa"), (18,1,NULL,"aaa"), (19,1,NULL,"aaa"), (20,1,NULL,"aaa"); select a.id1, b.idnull from t1 as a, t1 as b where a.id2=1 and a.id1=1 and b.id1=a.idnull order by b.id2 desc limit 1; id1 idnull drop table t1; create table t1 ( id int not null auto_increment, name char(1) not null, uid int not null, primary key (id), index uid_index (uid)); create table t2 ( id int not null auto_increment, name char(1) not null, uid int not null, primary key (id), index uid_index (uid)); insert into t1(id, uid, name) values(1, 0, ' '); insert into t1(uid, name) values(0, ' '); insert into t2(uid, name) select uid, name from t1; insert into t1(uid, name) select uid, name from t2; insert into t2(uid, name) select uid, name from t1; insert into t1(uid, name) select uid, name from t2; insert into t2(uid, name) select uid, name from t1; insert into t1(uid, name) select uid, name from t2; insert into t2(uid, name) select uid, name from t1; insert into t1(uid, name) select uid, name from t2; insert into t2(uid, name) select uid, name from t1; insert into t1(uid, name) select uid, name from t2; insert into t2(uid, name) select uid, name from t1; insert into t2(uid, name) select uid, name from t1; insert into t2(uid, name) select uid, name from t1; insert into t2(uid, name) select uid, name from t1; insert into t1(uid, name) select uid, name from t2; delete from t2; insert into t2(uid, name) values (1, CHAR(64+1)), (2, CHAR(64+2)), (3, CHAR(64+3)), (4, CHAR(64+4)), (5, CHAR(64+5)), (6, CHAR(64+6)), (7, CHAR(64+7)), (8, CHAR(64+8)), (9, CHAR(64+9)), (10, CHAR(64+10)), (11, CHAR(64+11)), (12, CHAR(64+12)), (13, CHAR(64+13)), (14, CHAR(64+14)), (15, CHAR(64+15)), (16, CHAR(64+16)), (17, CHAR(64+17)), (18, CHAR(64+18)), (19, CHAR(64+19)), (20, CHAR(64+20)), (21, CHAR(64+21)), (22, CHAR(64+22)), (23, CHAR(64+23)), (24, CHAR(64+24)), (25, CHAR(64+25)), (26, CHAR(64+26)); insert into t1(uid, name) select uid, name from t2 order by uid; delete from t2; insert into t2(id, uid, name) select id, uid, name from t1; select count(*) from t1; count(*) 1026 select count(*) from t2; count(*) 1026 analyze table t1,t2; Table Op Msg_type Msg_text test.t1 analyze status OK test.t2 analyze status Table is already up to date explain select * from t1, t2 where t1.uid=t2.uid AND t1.uid > 0; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range uid_index uid_index 4 NULL 112 Using index condition; Using MRR 1 SIMPLE t2 ref uid_index uid_index 4 test.t1.uid 38 NULL explain select * from t1, t2 where t1.uid=t2.uid AND t2.uid > 0; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range uid_index uid_index 4 NULL 112 Using index condition; Using MRR 1 SIMPLE t2 ref uid_index uid_index 4 test.t1.uid 38 NULL explain select * from t1, t2 where t1.uid=t2.uid AND t1.uid != 0; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range uid_index uid_index 4 NULL 113 Using index condition; Using MRR 1 SIMPLE t2 ref uid_index uid_index 4 test.t1.uid 38 NULL explain select * from t1, t2 where t1.uid=t2.uid AND t2.uid != 0; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range uid_index uid_index 4 NULL 113 Using index condition; Using MRR 1 SIMPLE t2 ref uid_index uid_index 4 test.t1.uid 38 NULL select * from t1, t2 where t1.uid=t2.uid AND t1.uid > 0; id name uid id name uid 1001 A 1 1001 A 1 1002 B 2 1002 B 2 1003 C 3 1003 C 3 1004 D 4 1004 D 4 1005 E 5 1005 E 5 1006 F 6 1006 F 6 1007 G 7 1007 G 7 1008 H 8 1008 H 8 1009 I 9 1009 I 9 1010 J 10 1010 J 10 1011 K 11 1011 K 11 1012 L 12 1012 L 12 1013 M 13 1013 M 13 1014 N 14 1014 N 14 1015 O 15 1015 O 15 1016 P 16 1016 P 16 1017 Q 17 1017 Q 17 1018 R 18 1018 R 18 1019 S 19 1019 S 19 1020 T 20 1020 T 20 1021 U 21 1021 U 21 1022 V 22 1022 V 22 1023 W 23 1023 W 23 1024 X 24 1024 X 24 1025 Y 25 1025 Y 25 1026 Z 26 1026 Z 26 select * from t1, t2 where t1.uid=t2.uid AND t1.uid != 0; id name uid id name uid 1001 A 1 1001 A 1 1002 B 2 1002 B 2 1003 C 3 1003 C 3 1004 D 4 1004 D 4 1005 E 5 1005 E 5 1006 F 6 1006 F 6 1007 G 7 1007 G 7 1008 H 8 1008 H 8 1009 I 9 1009 I 9 1010 J 10 1010 J 10 1011 K 11 1011 K 11 1012 L 12 1012 L 12 1013 M 13 1013 M 13 1014 N 14 1014 N 14 1015 O 15 1015 O 15 1016 P 16 1016 P 16 1017 Q 17 1017 Q 17 1018 R 18 1018 R 18 1019 S 19 1019 S 19 1020 T 20 1020 T 20 1021 U 21 1021 U 21 1022 V 22 1022 V 22 1023 W 23 1023 W 23 1024 X 24 1024 X 24 1025 Y 25 1025 Y 25 1026 Z 26 1026 Z 26 drop table t1,t2; create table t1 (x bigint unsigned not null); insert into t1(x) values (0xfffffffffffffff0); insert into t1(x) values (0xfffffffffffffff1); select * from t1; x 18446744073709551600 18446744073709551601 select count(*) from t1 where x>0; count(*) 2 select count(*) from t1 where x=0; count(*) 0 select count(*) from t1 where x<0; count(*) 0 select count(*) from t1 where x < -16; count(*) 0 select count(*) from t1 where x = -16; count(*) 0 select count(*) from t1 where x > -16; count(*) 2 select count(*) from t1 where x = 18446744073709551601; count(*) 1 create table t2 (x bigint not null); insert into t2(x) values (-16); insert into t2(x) values (-15); select * from t2; x -16 -15 select count(*) from t2 where x>0; count(*) 0 select count(*) from t2 where x=0; count(*) 0 select count(*) from t2 where x<0; count(*) 2 select count(*) from t2 where x < -16; count(*) 0 select count(*) from t2 where x = -16; count(*) 1 select count(*) from t2 where x > -16; count(*) 1 select count(*) from t2 where x = 18446744073709551601; count(*) 0 drop table t1,t2; create table t1 (x bigint unsigned not null primary key) engine=innodb; insert into t1(x) values (0xfffffffffffffff0); insert into t1(x) values (0xfffffffffffffff1); select * from t1; x 18446744073709551600 18446744073709551601 select count(*) from t1 where x>0; count(*) 2 select count(*) from t1 where x=0; count(*) 0 select count(*) from t1 where x<0; count(*) 0 select count(*) from t1 where x < -16; count(*) 0 select count(*) from t1 where x = -16; count(*) 0 select count(*) from t1 where x > -16; count(*) 2 select count(*) from t1 where x = 18446744073709551601; count(*) 1 drop table t1; create table t1 (a bigint unsigned); create index t1i on t1(a); insert into t1 select 18446744073709551615; insert into t1 select 18446744073709551614; explain select * from t1 where a <> -1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index t1i t1i 9 NULL 2 Using where; Using index select * from t1 where a <> -1; a 18446744073709551614 18446744073709551615 explain select * from t1 where a > -1 or a < -1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index t1i t1i 9 NULL 2 Using where; Using index select * from t1 where a > -1 or a < -1; a 18446744073709551614 18446744073709551615 explain select * from t1 where a > -1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index t1i t1i 9 NULL 2 Using where; Using index select * from t1 where a > -1; a 18446744073709551614 18446744073709551615 explain select * from t1 where a < -1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables select * from t1 where a < -1; a drop table t1; set names latin1; create table t1 (a char(10), b text, key (a)) character set latin1; INSERT INTO t1 (a) VALUES ('111'),('222'),('222'),('222'),('222'),('444'),('aaa'),('AAA'),('bbb'); explain select * from t1 where a='aaa'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref a a 11 const 2 Using index condition explain select * from t1 where a=binary 'aaa'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 11 NULL 2 Using index condition; Using MRR explain select * from t1 where a='aaa' collate latin1_bin; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 11 NULL 2 Using index condition; Using MRR explain select * from t1 where a='aaa' collate latin1_german1_ci; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL a NULL NULL NULL 9 Using where drop table t1; CREATE TABLE t1 ( `CLIENT` char(3) character set latin1 collate latin1_bin NOT NULL default '000', `ARG1` char(3) character set latin1 collate latin1_bin NOT NULL default '', `ARG2` char(3) character set latin1 collate latin1_bin NOT NULL default '', `FUNCTION` varchar(10) character set latin1 collate latin1_bin NOT NULL default '', `FUNCTINT` int(11) NOT NULL default '0', KEY `VERI_CLNT~2` (`ARG1`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; INSERT INTO t1 VALUES ('000',' 0',' 0','Text 001',0), ('000',' 0',' 1','Text 002',0), ('000',' 1',' 2','Text 003',0), ('000',' 2',' 3','Text 004',0), ('001',' 3',' 0','Text 017',0); SELECT count(*) FROM t1 WHERE CLIENT='000' AND (ARG1 != ' 1' OR ARG1 != ' 2'); count(*) 4 SELECT count(*) FROM t1 WHERE CLIENT='000' AND (ARG1 != ' 2' OR ARG1 != ' 1'); count(*) 4 drop table t1; create table t1 (a int); insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); CREATE TABLE t2 ( pk1 int(11) NOT NULL, pk2 int(11) NOT NULL, pk3 int(11) NOT NULL, pk4 int(11) NOT NULL, filler char(82), PRIMARY KEY (pk1,pk2,pk3,pk4) ) DEFAULT CHARSET=latin1; insert into t2 select 1, A.a+10*B.a, 432, 44, 'fillerZ' from t1 A, t1 B; INSERT INTO t2 VALUES (2621, 2635, 0, 0,'filler'), (2621, 2635, 1, 0,'filler'), (2621, 2635, 10, 0,'filler'), (2621, 2635, 11, 0,'filler'), (2621, 2635, 14, 0,'filler'), (2621, 2635, 1000015, 0,'filler'); SELECT * FROM t2 WHERE ((((pk4 =0) AND (pk1 =2621) AND (pk2 =2635))) OR ((pk4 =1) AND (((pk1 IN ( 7, 2, 1 ))) OR (pk1 =522)) AND ((pk2 IN ( 0, 2635)))) ) AND (pk3 >=1000000); pk1 pk2 pk3 pk4 filler 2621 2635 1000015 0 filler drop table t1, t2; create table t1(a char(2), key(a(1))); insert into t1 values ('x'), ('xx'); explain select a from t1 where a > 'x'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 2 NULL 2 Using where select a from t1 where a > 'x'; a xx drop table t1; CREATE TABLE t1 ( OXID varchar(32) COLLATE latin1_german2_ci NOT NULL DEFAULT '', OXPARENTID varchar(32) COLLATE latin1_german2_ci NOT NULL DEFAULT 'oxrootid', OXLEFT int NOT NULL DEFAULT '0', OXRIGHT int NOT NULL DEFAULT '0', OXROOTID varchar(32) COLLATE latin1_german2_ci NOT NULL DEFAULT '', PRIMARY KEY (OXID), KEY OXNID (OXID), KEY OXLEFT (OXLEFT), KEY OXRIGHT (OXRIGHT), KEY OXROOTID (OXROOTID) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_german2_ci; INSERT INTO t1 VALUES ('d8c4177d09f8b11f5.52725521','oxrootid',1,40,'d8c4177d09f8b11f5.52725521'), ('d8c4177d151affab2.81582770','d8c4177d09f8b11f5.52725521',2,3, 'd8c4177d09f8b11f5.52725521'), ('d8c4177d206a333d2.74422679','d8c4177d09f8b11f5.52725521',4,5, 'd8c4177d09f8b11f5.52725521'), ('d8c4177d225791924.30714720','d8c4177d09f8b11f5.52725521',6,7, 'd8c4177d09f8b11f5.52725521'), ('d8c4177d2380fc201.39666693','d8c4177d09f8b11f5.52725521',8,9, 'd8c4177d09f8b11f5.52725521'), ('d8c4177d24ccef970.14957924','d8c4177d09f8b11f5.52725521',10,11, 'd8c4177d09f8b11f5.52725521'); EXPLAIN SELECT s.oxid FROM t1 v, t1 s WHERE s.oxrootid = 'd8c4177d09f8b11f5.52725521' AND v.oxrootid ='d8c4177d09f8b11f5.52725521' AND s.oxleft > v.oxleft AND s.oxleft < v.oxright; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE v ref OXLEFT,OXRIGHT,OXROOTID OXROOTID 34 const 5 Using index condition 1 SIMPLE s ref OXLEFT,OXROOTID OXROOTID 34 const 5 Using index condition; Using where SELECT s.oxid FROM t1 v, t1 s WHERE s.oxrootid = 'd8c4177d09f8b11f5.52725521' AND v.oxrootid ='d8c4177d09f8b11f5.52725521' AND s.oxleft > v.oxleft AND s.oxleft < v.oxright; oxid d8c4177d151affab2.81582770 d8c4177d206a333d2.74422679 d8c4177d225791924.30714720 d8c4177d2380fc201.39666693 d8c4177d24ccef970.14957924 DROP TABLE t1; create table t1 ( c1 char(10), c2 char(10), c3 char(10), c4 char(10), c5 char(10), c6 char(10), c7 char(10), c8 char(10), c9 char(10), c10 char(10), c11 char(10), c12 char(10), c13 char(10), c14 char(10), c15 char(10), c16 char(10), index(c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12,c13,c14,c15,c16) ); insert into t1 (c1) values ('1'),('1'),('1'),('1'); select * from t1 where c1 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh", "abcdefg1", "123456781", "qwertyui1", "asddfg1", "abcdefg2", "123456782", "qwertyui2", "asddfg2", "abcdefg3", "123456783", "qwertyui3", "asddfg3", "abcdefg4", "123456784", "qwertyui4", "asddfg4", "abcdefg5", "123456785", "qwertyui5", "asddfg5", "abcdefg6", "123456786", "qwertyui6", "asddfg6", "abcdefg7", "123456787", "qwertyui7", "asddfg7", "abcdefg8", "123456788", "qwertyui8", "asddfg8", "abcdefg9", "123456789", "qwertyui9", "asddfg9", "abcdefgA", "12345678A", "qwertyuiA", "asddfgA", "abcdefgB", "12345678B", "qwertyuiB", "asddfgB", "abcdefgC", "12345678C", "qwertyuiC", "asddfgC") and c2 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh", "abcdefg1", "123456781", "qwertyui1", "asddfg1", "abcdefg2", "123456782", "qwertyui2", "asddfg2", "abcdefg3", "123456783", "qwertyui3", "asddfg3", "abcdefg4", "123456784", "qwertyui4", "asddfg4", "abcdefg5", "123456785", "qwertyui5", "asddfg5", "abcdefg6", "123456786", "qwertyui6", "asddfg6", "abcdefg7", "123456787", "qwertyui7", "asddfg7", "abcdefg8", "123456788", "qwertyui8", "asddfg8", "abcdefg9", "123456789", "qwertyui9", "asddfg9", "abcdefgA", "12345678A", "qwertyuiA", "asddfgA", "abcdefgB", "12345678B", "qwertyuiB", "asddfgB", "abcdefgC", "12345678C", "qwertyuiC", "asddfgC") and c3 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh", "abcdefg1", "123456781", "qwertyui1", "asddfg1", "abcdefg2", "123456782", "qwertyui2", "asddfg2", "abcdefg3", "123456783", "qwertyui3", "asddfg3", "abcdefg4", "123456784", "qwertyui4", "asddfg4", "abcdefg5", "123456785", "qwertyui5", "asddfg5", "abcdefg6", "123456786", "qwertyui6", "asddfg6", "abcdefg7", "123456787", "qwertyui7", "asddfg7", "abcdefg8", "123456788", "qwertyui8", "asddfg8", "abcdefg9", "123456789", "qwertyui9", "asddfg9", "abcdefgA", "12345678A", "qwertyuiA", "asddfgA", "abcdefgB", "12345678B", "qwertyuiB", "asddfgB", "abcdefgC", "12345678C", "qwertyuiC", "asddfgC") and c4 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh", "abcdefg1", "123456781", "qwertyui1", "asddfg1", "abcdefg2", "123456782", "qwertyui2", "asddfg2", "abcdefg3", "123456783", "qwertyui3", "asddfg3", "abcdefg4", "123456784", "qwertyui4", "asddfg4", "abcdefg5", "123456785", "qwertyui5", "asddfg5", "abcdefg6", "123456786", "qwertyui6", "asddfg6", "abcdefg7", "123456787", "qwertyui7", "asddfg7", "abcdefg8", "123456788", "qwertyui8", "asddfg8", "abcdefg9", "123456789", "qwertyui9", "asddfg9", "abcdefgA", "12345678A", "qwertyuiA", "asddfgA", "abcdefgB", "12345678B", "qwertyuiB", "asddfgB", "abcdefgC", "12345678C", "qwertyuiC", "asddfgC") and c5 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh", "abcdefg1", "123456781", "qwertyui1", "asddfg1", "abcdefg2", "123456782", "qwertyui2", "asddfg2", "abcdefg3", "123456783", "qwertyui3", "asddfg3", "abcdefg4", "123456784", "qwertyui4", "asddfg4", "abcdefg5", "123456785", "qwertyui5", "asddfg5", "abcdefg6", "123456786", "qwertyui6", "asddfg6", "abcdefg7", "123456787", "qwertyui7", "asddfg7", "abcdefg8", "123456788", "qwertyui8", "asddfg8", "abcdefg9", "123456789", "qwertyui9", "asddfg9", "abcdefgA", "12345678A", "qwertyuiA", "asddfgA", "abcdefgB", "12345678B", "qwertyuiB", "asddfgB", "abcdefgC", "12345678C", "qwertyuiC", "asddfgC") and c6 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh", "abcdefg1", "123456781", "qwertyui1", "asddfg1", "abcdefg2", "123456782", "qwertyui2", "asddfg2", "abcdefg3", "123456783", "qwertyui3", "asddfg3", "abcdefg4", "123456784", "qwertyui4", "asddfg4", "abcdefg5", "123456785", "qwertyui5", "asddfg5", "abcdefg6", "123456786", "qwertyui6", "asddfg6", "abcdefg7", "123456787", "qwertyui7", "asddfg7", "abcdefg8", "123456788", "qwertyui8", "asddfg8", "abcdefg9", "123456789", "qwertyui9", "asddfg9", "abcdefgA", "12345678A", "qwertyuiA", "asddfgA", "abcdefgB", "12345678B", "qwertyuiB", "asddfgB", "abcdefgC", "12345678C", "qwertyuiC", "asddfgC") and c7 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh", "abcdefg1", "123456781", "qwertyui1", "asddfg1", "abcdefg2", "123456782", "qwertyui2", "asddfg2", "abcdefg3", "123456783", "qwertyui3", "asddfg3", "abcdefg4", "123456784", "qwertyui4", "asddfg4", "abcdefg5", "123456785", "qwertyui5", "asddfg5", "abcdefg6", "123456786", "qwertyui6", "asddfg6", "abcdefg7", "123456787", "qwertyui7", "asddfg7", "abcdefg8", "123456788", "qwertyui8", "asddfg8", "abcdefg9", "123456789", "qwertyui9", "asddfg9", "abcdefgA", "12345678A", "qwertyuiA", "asddfgA", "abcdefgB", "12345678B", "qwertyuiB", "asddfgB", "abcdefgC", "12345678C", "qwertyuiC", "asddfgC") and c8 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh", "abcdefg1", "123456781", "qwertyui1", "asddfg1", "abcdefg2", "123456782", "qwertyui2", "asddfg2", "abcdefg3", "123456783", "qwertyui3", "asddfg3", "abcdefg4", "123456784", "qwertyui4", "asddfg4", "abcdefg5", "123456785", "qwertyui5", "asddfg5", "abcdefg6", "123456786", "qwertyui6", "asddfg6", "abcdefg7", "123456787", "qwertyui7", "asddfg7", "abcdefg8", "123456788", "qwertyui8", "asddfg8", "abcdefg9", "123456789", "qwertyui9", "asddfg9", "abcdefgA", "12345678A", "qwertyuiA", "asddfgA", "abcdefgB", "12345678B", "qwertyuiB", "asddfgB", "abcdefgC", "12345678C", "qwertyuiC", "asddfgC") and c9 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh", "abcdefg1", "123456781", "qwertyui1", "asddfg1", "abcdefg2", "123456782", "qwertyui2", "asddfg2", "abcdefg3", "123456783", "qwertyui3", "asddfg3", "abcdefg4", "123456784", "qwertyui4", "asddfg4", "abcdefg5", "123456785", "qwertyui5", "asddfg5", "abcdefg6", "123456786", "qwertyui6", "asddfg6", "abcdefg7", "123456787", "qwertyui7", "asddfg7", "abcdefg8", "123456788", "qwertyui8", "asddfg8", "abcdefg9", "123456789", "qwertyui9", "asddfg9", "abcdefgA", "12345678A", "qwertyuiA", "asddfgA", "abcdefgB", "12345678B", "qwertyuiB", "asddfgB", "abcdefgC", "12345678C", "qwertyuiC", "asddfgC") and c10 in ("abcdefgh", "123456789", "qwertyuio", "asddfgh", "abcdefg1", "123456781", "qwertyui1", "asddfg1", "abcdefg2", "123456782", "qwertyui2", "asddfg2", "abcdefg3", "123456783", "qwertyui3", "asddfg3", "abcdefg4", "123456784", "qwertyui4", "asddfg4", "abcdefg5", "123456785", "qwertyui5", "asddfg5", "abcdefg6", "123456786", "qwertyui6", "asddfg6", "abcdefg7", "123456787", "qwertyui7", "asddfg7", "abcdefg8", "123456788", "qwertyui8", "asddfg8", "abcdefg9", "123456789", "qwertyui9", "asddfg9", "abcdefgA", "12345678A", "qwertyuiA", "asddfgA", "abcdefgB", "12345678B", "qwertyuiB", "asddfgB", "abcdefgC", "12345678C", "qwertyuiC", "asddfgC"); c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 c11 c12 c13 c14 c15 c16 drop table t1; End of 4.1 tests CREATE TABLE t1 ( id int(11) NOT NULL auto_increment, status varchar(20), PRIMARY KEY (id), KEY (status) ); INSERT INTO t1 VALUES (1,'B'), (2,'B'), (3,'B'), (4,'B'), (5,'B'), (6,'B'), (7,'B'), (8,'B'), (9,'B'), (10,'B'), (11,'B'), (12,'B'), (13,'B'), (14,'B'), (15,'B'), (16,'B'), (17,'B'), (18,'B'), (19,'B'), (20,'B'), (21,'B'), (22,'B'), (23,'B'), (24,'B'), (25,'A'), (26,'A'), (27,'A'), (28,'A'), (29,'A'), (30,'A'), (31,'A'), (32,'A'), (33,'A'), (34,'A'), (35,'A'), (36,'A'), (37,'A'), (38,'A'), (39,'A'), (40,'A'), (41,'A'), (42,'A'), (43,'A'), (44,'A'), (45,'A'), (46,'A'), (47,'A'), (48,'A'), (49,'A'), (50,'A'), (51,'A'), (52,'A'), (53,'C'), (54,'C'), (55,'C'), (56,'C'), (57,'C'), (58,'C'), (59,'C'), (60,'C'); EXPLAIN SELECT * FROM t1 WHERE status <> 'A' AND status <> 'B'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range status status 23 NULL 11 Using index condition; Using MRR EXPLAIN SELECT * FROM t1 WHERE status NOT IN ('A','B'); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range status status 23 NULL 11 Using index condition; Using MRR SELECT * FROM t1 WHERE status <> 'A' AND status <> 'B'; id status 53 C 54 C 55 C 56 C 57 C 58 C 59 C 60 C SELECT * FROM t1 WHERE status NOT IN ('A','B'); id status 53 C 54 C 55 C 56 C 57 C 58 C 59 C 60 C EXPLAIN SELECT status FROM t1 WHERE status <> 'A' AND status <> 'B'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range status status 23 NULL 11 Using where; Using index EXPLAIN SELECT status FROM t1 WHERE status NOT IN ('A','B'); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range status status 23 NULL 11 Using where; Using index EXPLAIN SELECT * FROM t1 WHERE status NOT BETWEEN 'A' AND 'B'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range status status 23 NULL 10 Using index condition; Using MRR EXPLAIN SELECT * FROM t1 WHERE status < 'A' OR status > 'B'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range status status 23 NULL 10 Using index condition; Using MRR SELECT * FROM t1 WHERE status NOT BETWEEN 'A' AND 'B'; id status 53 C 54 C 55 C 56 C 57 C 58 C 59 C 60 C SELECT * FROM t1 WHERE status < 'A' OR status > 'B'; id status 53 C 54 C 55 C 56 C 57 C 58 C 59 C 60 C DROP TABLE t1; CREATE TABLE t1 (a int, b int, primary key(a,b)); INSERT INTO t1 VALUES (1,1),(1,2),(1,3),(2,1),(2,2),(2,3),(3,1),(3,2),(3,3),(4,1),(4,2),(4,3); CREATE VIEW v1 as SELECT a,b FROM t1 WHERE b=3; EXPLAIN SELECT a,b FROM t1 WHERE a < 2 and b=3; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 4 Using where; Using index EXPLAIN SELECT a,b FROM v1 WHERE a < 2 and b=3; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 4 Using where; Using index EXPLAIN SELECT a,b FROM t1 WHERE a < 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 4 Using where; Using index EXPLAIN SELECT a,b FROM v1 WHERE a < 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 4 Using where; Using index SELECT a,b FROM t1 WHERE a < 2 and b=3; a b 1 3 SELECT a,b FROM v1 WHERE a < 2 and b=3; a b 1 3 DROP VIEW v1; DROP TABLE t1; CREATE TABLE t1 (name varchar(15) NOT NULL, KEY idx(name)); INSERT INTO t1 VALUES ('Betty'), ('Anna'); SELECT * FROM t1; name Anna Betty DELETE FROM t1 WHERE name NOT LIKE 'A%a'; SELECT * FROM t1; name Anna DROP TABLE t1; CREATE TABLE t1 (a int, KEY idx(a)); INSERT INTO t1 VALUES (NULL), (1), (2), (3); SELECT * FROM t1; a NULL 1 2 3 DELETE FROM t1 WHERE NOT(a <=> 2); SELECT * FROM t1; a 2 DROP TABLE t1; create table t1 (a int, b int, primary key(a,b)); create view v1 as select a, b from t1; INSERT INTO `t1` VALUES (0,0),(1,0),(2,0),(3,0),(4,0),(5,1),(6,1),(7,1),(8,1),(9,1),(10,2),(11,2),(12,2) ,(13,2),(14,2),(15,3),(16,3),(17,3),(18,3),(19,3); explain select * from t1 where a in (3,4) and b in (1,2,3); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY PRIMARY 8 NULL # Using where; Using index explain select * from v1 where a in (3,4) and b in (1,2,3); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY PRIMARY 8 NULL # Using where; Using index explain select * from t1 where a between 3 and 4 and b between 1 and 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY PRIMARY 8 NULL # Using where; Using index explain select * from v1 where a between 3 and 4 and b between 1 and 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY PRIMARY 8 NULL # Using where; Using index drop view v1; drop table t1; create table t3 (a int); insert into t3 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t1 (a varchar(10), filler char(200), key(a)) charset=binary; insert into t1 values ('a',''); insert into t1 values ('a ',''); insert into t1 values ('a ', ''); insert into t1 select concat('a', 1000 + A.a + 10 * (B.a + 10 * C.a)), '' from t3 A, t3 B, t3 C; create table t2 (a varchar(10), filler char(200), key(a)); insert into t2 select * from t1; explain select * from t1 where a between 'a' and 'a '; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 13 NULL # Using index condition; Using MRR explain select * from t1 where a = 'a' or a='a '; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 13 NULL # Using index condition; Using MRR explain select * from t2 where a between 'a' and 'a '; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ref a a 13 const # Using index condition explain select * from t2 where a = 'a' or a='a '; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ref a a 13 const # Using index condition update t1 set a='b' where a<>'a'; explain select * from t1 where a not between 'b' and 'b'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 13 NULL # Using index condition; Using MRR select a, hex(filler) from t1 where a not between 'b' and 'b'; a hex(filler) a 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 drop table t1,t2,t3; create table t1 (a int); insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t2 (a int, key(a)); insert into t2 select 2*(A.a + 10*(B.a + 10*C.a)) from t1 A, t1 B, t1 C; set @a="select * from t2 force index (a) where a NOT IN(0"; select count(*) from (select @a:=concat(@a, ',', a) from t2 ) Z; count(*) 1000 set @a=concat(@a, ')'); insert into t2 values (11),(13),(15); set @b= concat("explain ", @a); prepare stmt1 from @b; execute stmt1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index a a 5 NULL 1003 Using where; Using index prepare stmt1 from @a; execute stmt1; a 11 13 15 drop table t1, t2; CREATE TABLE t1 ( id int NOT NULL DEFAULT '0', b int NOT NULL DEFAULT '0', c int NOT NULL DEFAULT '0', INDEX idx1(b,c), INDEX idx2(c)); INSERT INTO t1(id) VALUES (1), (2), (3), (4), (5), (6), (7), (8); INSERT INTO t1(b,c) VALUES (3,4), (3,4); SELECT * FROM t1 WHERE b<=3 AND 3<=c; id b c 0 3 4 0 3 4 SELECT * FROM t1 WHERE 3 BETWEEN b AND c; id b c 0 3 4 0 3 4 EXPLAIN SELECT * FROM t1 WHERE b<=3 AND 3<=c; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx1,idx2 idx2 4 NULL 3 Using index condition; Using where; Using MRR EXPLAIN SELECT * FROM t1 WHERE 3 BETWEEN b AND c; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx1,idx2 idx2 4 NULL 3 Using where; Using MRR SELECT * FROM t1 WHERE 0 < b OR 0 > c; id b c 0 3 4 0 3 4 SELECT * FROM t1 WHERE 0 NOT BETWEEN b AND c; id b c 0 3 4 0 3 4 EXPLAIN SELECT * FROM t1 WHERE 0 < b OR 0 > c; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL idx1,idx2 NULL NULL NULL 10 Using where EXPLAIN SELECT * FROM t1 WHERE 0 NOT BETWEEN b AND c; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL idx1,idx2 NULL NULL NULL 10 Using where DROP TABLE t1; CREATE TABLE t1 ( item char(20) NOT NULL default '', started datetime NOT NULL default '0000-00-00 00:00:00', price decimal(16,3) NOT NULL default '0.000', PRIMARY KEY (item,started) ) ENGINE=MyISAM; INSERT INTO t1 VALUES ('A1','2005-11-01 08:00:00',1000), ('A1','2005-11-15 00:00:00',2000), ('A1','2005-12-12 08:00:00',3000), ('A2','2005-12-01 08:00:00',1000); EXPLAIN SELECT * FROM t1 WHERE item='A1' AND started<='2005-12-01 24:00:00'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref PRIMARY PRIMARY 20 const 2 Using index condition Warnings: Warning 1292 Incorrect datetime value: '2005-12-01 24:00:00' for column 'started' at row 1 Warning 1292 Incorrect datetime value: '2005-12-01 24:00:00' for column 'started' at row 1 SELECT * FROM t1 WHERE item='A1' AND started<='2005-12-01 24:00:00'; item started price A1 2005-11-01 08:00:00 1000.000 A1 2005-11-15 00:00:00 2000.000 Warnings: Warning 1292 Incorrect datetime value: '2005-12-01 24:00:00' for column 'started' at row 1 Warning 1292 Incorrect datetime value: '2005-12-01 24:00:00' for column 'started' at row 1 SELECT * FROM t1 WHERE item='A1' AND started<='2005-12-02 00:00:00'; item started price A1 2005-11-01 08:00:00 1000.000 A1 2005-11-15 00:00:00 2000.000 DROP INDEX `PRIMARY` ON t1; EXPLAIN SELECT * FROM t1 WHERE item='A1' AND started<='2005-12-01 24:00:00'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using where Warnings: Warning 1292 Incorrect datetime value: '2005-12-01 24:00:00' for column 'started' at row 1 SELECT * FROM t1 WHERE item='A1' AND started<='2005-12-01 24:00:00'; item started price A1 2005-11-01 08:00:00 1000.000 A1 2005-11-15 00:00:00 2000.000 Warnings: Warning 1292 Incorrect datetime value: '2005-12-01 24:00:00' for column 'started' at row 1 SELECT * FROM t1 WHERE item='A1' AND started<='2005-12-02 00:00:00'; item started price A1 2005-11-01 08:00:00 1000.000 A1 2005-11-15 00:00:00 2000.000 DROP TABLE t1; BUG#32198 "Comparison of DATE with DATETIME still not using indexes correctly" CREATE TABLE t1 ( id int(11) NOT NULL auto_increment, dateval date default NULL, PRIMARY KEY (id), KEY dateval (dateval) ) AUTO_INCREMENT=173; INSERT INTO t1 VALUES (1,'2007-01-01'),(2,'2007-01-02'),(3,'2007-01-03'),(4,'2007-01-04'), (5,'2007-01-05'),(6,'2007-01-06'),(7,'2007-01-07'),(8,'2007-01-08'), (9,'2007-01-09'),(10,'2007-01-10'),(11,'2007-01-11'); This must use range access: explain select * from t1 where dateval >= '2007-01-01 00:00:00' and dateval <= '2007-01-02 23:59:59'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range dateval dateval 4 NULL 2 Using index condition; Using MRR drop table t1; CREATE TABLE t1 ( a varchar(32), index (a) ) DEFAULT CHARSET=latin1 COLLATE=latin1_bin; INSERT INTO t1 VALUES ('B'), ('A'), ('A'), ('C'), ('B'), ('A'), ('A'); SELECT a FROM t1 WHERE a='b' OR a='B'; a B B EXPLAIN SELECT a FROM t1 WHERE a='b' OR a='B'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 35 NULL 3 Using where; Using index DROP TABLE t1; CREATE TABLE t1 (f1 TINYINT(11) UNSIGNED NOT NULL, PRIMARY KEY (f1)); INSERT INTO t1 VALUES (127),(254),(0),(1),(255); SELECT SQL_NO_CACHE COUNT(*) FROM t1 WHERE f1 < 256; COUNT(*) 5 SELECT SQL_NO_CACHE COUNT(*) FROM t1 WHERE f1 < 256.0; COUNT(*) 5 SELECT SQL_NO_CACHE COUNT(*) FROM t1 WHERE f1 < 255; COUNT(*) 4 SELECT SQL_NO_CACHE COUNT(*) FROM t1 WHERE f1 < -1; COUNT(*) 0 SELECT SQL_NO_CACHE COUNT(*) FROM t1 WHERE f1 > -1; COUNT(*) 5 DROP TABLE t1; CREATE TABLE t1 ( f1 TINYINT(11) NOT NULL, PRIMARY KEY (f1)); INSERT INTO t1 VALUES (127),(126),(0),(-128),(-127); SELECT SQL_NO_CACHE COUNT(*) FROM t1 WHERE f1 < 128; COUNT(*) 5 SELECT SQL_NO_CACHE COUNT(*) FROM t1 WHERE f1 < 128.0; COUNT(*) 5 SELECT SQL_NO_CACHE COUNT(*) FROM t1 WHERE f1 < 127; COUNT(*) 4 SELECT SQL_NO_CACHE COUNT(*) FROM t1 WHERE f1 > -129; COUNT(*) 5 SELECT SQL_NO_CACHE COUNT(*) FROM t1 WHERE f1 > -129.0; COUNT(*) 5 SELECT SQL_NO_CACHE COUNT(*) FROM t1 WHERE f1 > -128; COUNT(*) 4 DROP TABLE t1; create table t1 (a int); insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); create table t2 (a int, b int, filler char(100)); insert into t2 select A.a + 10 * (B.a + 10 * C.a), 10, 'filler' from t1 A, t1 B, t1 C where A.a < 5; insert into t2 select 1000, b, 'filler' from t2; alter table t2 add index (a,b); select 'In following EXPLAIN the access method should be ref or range, #rows~=500 (and not 2)' Z; Z In following EXPLAIN the access method should be ref or range, #rows~=500 (and not 2) explain select * from t2 where a=1000 and b<11; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range a a 10 NULL 502 Using index condition; Using MRR drop table t1, t2; CREATE TABLE t1( a INT, b INT, KEY( a, b ) ); CREATE TABLE t2( a INT, b INT, KEY( a, b ) ); CREATE TABLE t3( a INT, b INT, KEY( a, b ) ); INSERT INTO t1( a, b ) VALUES (0, 1), (1, 2), (1, 4), (2, 3), (5, 0), (9, 7); INSERT INTO t2( a, b ) VALUES ( 1, 1), ( 2, 1), ( 3, 1), ( 4, 1), ( 5, 1), ( 6, 1), ( 7, 1), ( 8, 1), ( 9, 1), (10, 1), (11, 1), (12, 1), (13, 1), (14, 1), (15, 1), (16, 1), (17, 1), (18, 1), (19, 1), (20, 1); INSERT INTO t2 SELECT a, 2 FROM t2 WHERE b = 1; INSERT INTO t2 SELECT a, 3 FROM t2 WHERE b = 1; INSERT INTO t2 SELECT -1, -1 FROM t2; INSERT INTO t2 SELECT -1, -1 FROM t2; INSERT INTO t2 SELECT -1, -1 FROM t2; INSERT INTO t3 VALUES (1, 0), (2, 0), (3, 0), (4, 0), (5, 0), (6, 0), (7, 0), (8, 0), (9, 0), (10, 0); INSERT INTO t3 SELECT * FROM t3 WHERE a = 10; INSERT INTO t3 SELECT * FROM t3 WHERE a = 10; SELECT * FROM t1 WHERE 3 <= a AND a < 5 OR 5 < a AND b = 3 OR 3 <= a; a b 5 0 9 7 EXPLAIN SELECT * FROM t1 WHERE 3 <= a AND a < 5 OR 5 < a AND b = 3 OR 3 <= a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 5 NULL 3 Using where; Using index SELECT * FROM t1 WHERE 3 <= a AND a < 5 OR 5 <= a AND b = 3 OR 3 <= a; a b 5 0 9 7 EXPLAIN SELECT * FROM t1 WHERE 3 <= a AND a < 5 OR 5 <= a AND b = 3 OR 3 <= a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 5 NULL 4 Using where; Using index SELECT * FROM t1 WHERE 3 <= a AND a <= 5 OR 5 <= a AND b = 3 OR 3 <= a; a b 5 0 9 7 EXPLAIN SELECT * FROM t1 WHERE 3 <= a AND a <= 5 OR 5 <= a AND b = 3 OR 3 <= a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 5 NULL 3 Using where; Using index SELECT * FROM t1 WHERE 3 <= a AND a <= 5 OR 3 <= a; a b 5 0 9 7 EXPLAIN SELECT * FROM t1 WHERE 3 <= a AND a <= 5 OR 3 <= a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range a a 5 NULL 3 Using where; Using index SELECT * FROM t2 WHERE 5 <= a AND a < 10 AND b = 1 OR 15 <= a AND a < 20 AND b = 3 OR 1 <= a AND b = 1; a b 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 11 1 12 1 13 1 14 1 15 1 15 3 16 1 16 3 17 1 17 3 18 1 18 3 19 1 19 3 20 1 EXPLAIN SELECT * FROM t2 WHERE 5 <= a AND a < 10 AND b = 1 OR 15 <= a AND a < 20 AND b = 3 OR 1 <= a AND b = 1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range a a 10 NULL 50 Using where; Using index SELECT * FROM t2 WHERE 5 <= a AND a < 10 AND b = 2 OR 15 <= a AND a < 20 AND b = 3 OR 1 <= a AND b = 1; a b 1 1 2 1 3 1 4 1 5 1 5 2 6 1 6 2 7 1 7 2 8 1 8 2 9 1 9 2 10 1 11 1 12 1 13 1 14 1 15 1 15 3 16 1 16 3 17 1 17 3 18 1 18 3 19 1 19 3 20 1 EXPLAIN SELECT * FROM t2 WHERE 5 <= a AND a < 10 AND b = 2 OR 15 <= a AND a < 20 AND b = 3 OR 1 <= a AND b = 1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range a a 10 NULL 50 Using where; Using index SELECT * FROM t3 WHERE 5 <= a AND a < 10 AND b = 3 OR a < 5 OR a < 10; a b 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 EXPLAIN SELECT * FROM t3 WHERE 5 <= a AND a < 10 AND b = 3 OR a < 5 OR a < 10; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t3 range a a 5 NULL 8 Using where; Using index DROP TABLE t1, t2, t3; # # Bug #47123: Endless 100% CPU loop with STRAIGHT_JOIN # CREATE TABLE t1(a INT, KEY(a)); INSERT INTO t1 VALUES (1), (NULL); SELECT * FROM t1 WHERE a <> NULL and (a <> NULL or a <= NULL); a DROP TABLE t1; # # Bug#47925: regression of range optimizer and date comparison in 5.1.39! # CREATE TABLE t1 ( a DATE, KEY ( a ) ); CREATE TABLE t2 ( a DATETIME, KEY ( a ) ); # Make optimizer choose range scan INSERT INTO t1 VALUES ('2009-09-22'), ('2009-09-22'), ('2009-09-22'); INSERT INTO t1 VALUES ('2009-09-23'), ('2009-09-23'), ('2009-09-23'); INSERT INTO t2 VALUES ('2009-09-22 12:00:00'), ('2009-09-22 12:00:00'), ('2009-09-22 12:00:00'); INSERT INTO t2 VALUES ('2009-09-23 12:00:00'), ('2009-09-23 12:00:00'), ('2009-09-23 12:00:00'); # DATE vs DATE EXPLAIN SELECT * FROM t1 WHERE a >= '2009/09/23'; id select_type table type possible_keys key key_len ref rows Extra X X X range a a X X X X SELECT * FROM t1 WHERE a >= '2009/09/23'; a 2009-09-23 2009-09-23 2009-09-23 SELECT * FROM t1 WHERE a >= '20090923'; a 2009-09-23 2009-09-23 2009-09-23 SELECT * FROM t1 WHERE a >= 20090923; a 2009-09-23 2009-09-23 2009-09-23 SELECT * FROM t1 WHERE a >= '2009-9-23'; a 2009-09-23 2009-09-23 2009-09-23 SELECT * FROM t1 WHERE a >= '2009.09.23'; a 2009-09-23 2009-09-23 2009-09-23 SELECT * FROM t1 WHERE a >= '2009:09:23'; a 2009-09-23 2009-09-23 2009-09-23 # DATE vs DATETIME EXPLAIN SELECT * FROM t2 WHERE a >= '2009/09/23'; id select_type table type possible_keys key key_len ref rows Extra X X X range a a X X X X SELECT * FROM t2 WHERE a >= '2009/09/23'; a 2009-09-23 12:00:00 2009-09-23 12:00:00 2009-09-23 12:00:00 SELECT * FROM t2 WHERE a >= '2009/09/23'; a 2009-09-23 12:00:00 2009-09-23 12:00:00 2009-09-23 12:00:00 SELECT * FROM t2 WHERE a >= '20090923'; a 2009-09-23 12:00:00 2009-09-23 12:00:00 2009-09-23 12:00:00 SELECT * FROM t2 WHERE a >= 20090923; a 2009-09-23 12:00:00 2009-09-23 12:00:00 2009-09-23 12:00:00 SELECT * FROM t2 WHERE a >= '2009-9-23'; a 2009-09-23 12:00:00 2009-09-23 12:00:00 2009-09-23 12:00:00 SELECT * FROM t2 WHERE a >= '2009.09.23'; a 2009-09-23 12:00:00 2009-09-23 12:00:00 2009-09-23 12:00:00 SELECT * FROM t2 WHERE a >= '2009:09:23'; a 2009-09-23 12:00:00 2009-09-23 12:00:00 2009-09-23 12:00:00 # DATETIME vs DATETIME EXPLAIN SELECT * FROM t2 WHERE a >= '2009/09/23 12:00:00'; id select_type table type possible_keys key key_len ref rows Extra X X X range a a X X X X SELECT * FROM t2 WHERE a >= '2009/09/23 12:00:00'; a 2009-09-23 12:00:00 2009-09-23 12:00:00 2009-09-23 12:00:00 SELECT * FROM t2 WHERE a >= '20090923120000'; a 2009-09-23 12:00:00 2009-09-23 12:00:00 2009-09-23 12:00:00 SELECT * FROM t2 WHERE a >= 20090923120000; a 2009-09-23 12:00:00 2009-09-23 12:00:00 2009-09-23 12:00:00 SELECT * FROM t2 WHERE a >= '2009-9-23 12:00:00'; a 2009-09-23 12:00:00 2009-09-23 12:00:00 2009-09-23 12:00:00 SELECT * FROM t2 WHERE a >= '2009.09.23 12:00:00'; a 2009-09-23 12:00:00 2009-09-23 12:00:00 2009-09-23 12:00:00 SELECT * FROM t2 WHERE a >= '2009:09:23 12:00:00'; a 2009-09-23 12:00:00 2009-09-23 12:00:00 2009-09-23 12:00:00 # DATETIME vs DATE EXPLAIN SELECT * FROM t1 WHERE a >= '2009/09/23 00:00:00'; id select_type table type possible_keys key key_len ref rows Extra X X X range a a X X X X SELECT * FROM t1 WHERE a >= '2009/09/23 00:00:00'; a 2009-09-23 2009-09-23 2009-09-23 SELECT * FROM t1 WHERE a >= '2009/09/23 00:00:00'; a 2009-09-23 2009-09-23 2009-09-23 SELECT * FROM t1 WHERE a >= '20090923000000'; a 2009-09-23 2009-09-23 2009-09-23 SELECT * FROM t1 WHERE a >= 20090923000000; a 2009-09-23 2009-09-23 2009-09-23 SELECT * FROM t1 WHERE a >= '2009-9-23 00:00:00'; a 2009-09-23 2009-09-23 2009-09-23 SELECT * FROM t1 WHERE a >= '2009.09.23 00:00:00'; a 2009-09-23 2009-09-23 2009-09-23 SELECT * FROM t1 WHERE a >= '2009:09:23 00:00:00'; a 2009-09-23 2009-09-23 2009-09-23 # Test of the new get_date_from_str implementation # Behavior differs slightly between the trunk and mysql-pe. # The former may give errors for the truncated values, while the latter # gives warnings. The purpose of this test is not to interfere, and only # preserve existing behavior. SELECT str_to_date('2007-10-00', '%Y-%m-%d') >= '' AND str_to_date('2007-10-00', '%Y-%m-%d') <= '2007/10/20'; str_to_date('2007-10-00', '%Y-%m-%d') >= '' AND str_to_date('2007-10-00', '%Y-%m-%d') <= '2007/10/20' 1 Warnings: Warning 1292 Truncated incorrect date value: '' SELECT str_to_date('2007-20-00', '%Y-%m-%d') >= '2007/10/20' AND str_to_date('2007-20-00', '%Y-%m-%d') <= ''; str_to_date('2007-20-00', '%Y-%m-%d') >= '2007/10/20' AND str_to_date('2007-20-00', '%Y-%m-%d') <= '' NULL Warnings: Warning 1292 Truncated incorrect date value: '' Warning 1411 Incorrect datetime value: '2007-20-00' for function str_to_date Warning 1411 Incorrect datetime value: '2007-20-00' for function str_to_date SELECT str_to_date('2007-10-00', '%Y-%m-%d') BETWEEN '' AND '2007/10/20'; str_to_date('2007-10-00', '%Y-%m-%d') BETWEEN '' AND '2007/10/20' 1 Warnings: Warning 1292 Truncated incorrect datetime value: '' SELECT str_to_date('2007-20-00', '%Y-%m-%d') BETWEEN '2007/10/20' AND ''; str_to_date('2007-20-00', '%Y-%m-%d') BETWEEN '2007/10/20' AND '' NULL Warnings: Warning 1411 Incorrect datetime value: '2007-20-00' for function str_to_date SELECT str_to_date('', '%Y-%m-%d'); str_to_date('', '%Y-%m-%d') 0000-00-00 DROP TABLE t1, t2; # # Bug#48459: valgrind errors with query using 'Range checked for each # record' # CREATE TABLE t1 ( a INT, b CHAR(2), c INT, d INT, KEY ( c ), KEY ( d, a, b ( 2 ) ), KEY ( b ( 1 ) ) ); INSERT INTO t1 VALUES ( NULL, 'a', 1, 2 ), ( NULL, 'a', 1, 2 ), ( 1, 'a', 1, 2 ), ( 1, 'a', 1, 2 ); CREATE TABLE t2 ( a INT, c INT, e INT, KEY ( e ) ); INSERT INTO t2 VALUES ( 1, 1, NULL ), ( 1, 1, NULL ); # Should not give Valgrind warnings SELECT 1 FROM t1, t2 WHERE t1.d <> '1' AND t1.b > '1' AND t1.a = t2.a AND t1.c = t2.c; 1 1 1 1 1 DROP TABLE t1, t2; # # Bug #48665: sql-bench's insert test fails due to wrong result # CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a)); INSERT INTO t1 VALUES (0,0), (1,1); EXPLAIN SELECT * FROM t1 FORCE INDEX (PRIMARY) WHERE (a>=1 AND a<=2) OR (a>=4 AND a<=5) OR (a>=0 AND a <=10); id select_type table type possible_keys key key_len ref rows Extra @ @ @ range @ @ @ @ @ @ # Should return 2 rows SELECT * FROM t1 FORCE INDEX (PRIMARY) WHERE (a>=1 AND a<=2) OR (a>=4 AND a<=5) OR (a>=0 AND a <=10); a b 0 0 1 1 DROP TABLE t1; # # Bug #54802: 'NOT BETWEEN' evaluation is incorrect # CREATE TABLE t1 (c_key INT, c_notkey INT, KEY(c_key)); INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3); EXPLAIN SELECT * FROM t1 WHERE 2 NOT BETWEEN c_notkey AND c_key; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL c_key NULL NULL NULL 3 Using where SELECT * FROM t1 WHERE 2 NOT BETWEEN c_notkey AND c_key; c_key c_notkey 1 1 3 3 DROP TABLE t1; # # Bug #57030: 'BETWEEN' evaluation is incorrect # CREATE TABLE t1(pk INT PRIMARY KEY, i4 INT); CREATE UNIQUE INDEX i4_uq ON t1(i4); INSERT INTO t1 VALUES (1,10), (2,20), (3,30); EXPLAIN SELECT * FROM t1 WHERE i4 BETWEEN 10 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 const i4_uq i4_uq 5 const 1 NULL SELECT * FROM t1 WHERE i4 BETWEEN 10 AND 10; pk i4 1 10 EXPLAIN SELECT * FROM t1 WHERE 10 BETWEEN i4 AND i4; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 const i4_uq i4_uq 5 const 1 NULL SELECT * FROM t1 WHERE 10 BETWEEN i4 AND i4; pk i4 1 10 EXPLAIN SELECT * FROM t1 WHERE 10 BETWEEN 10 AND i4; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range i4_uq i4_uq 5 NULL 3 Using index condition; Using MRR SELECT * FROM t1 WHERE 10 BETWEEN 10 AND i4; pk i4 1 10 2 20 3 30 EXPLAIN SELECT * FROM t1 WHERE 10 BETWEEN i4 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range i4_uq i4_uq 5 NULL 1 Using index condition; Using MRR SELECT * FROM t1 WHERE 10 BETWEEN i4 AND 10; pk i4 1 10 EXPLAIN SELECT * FROM t1 WHERE 10 BETWEEN 10 AND 10; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 NULL SELECT * FROM t1 WHERE 10 BETWEEN 10 AND 10; pk i4 1 10 2 20 3 30 EXPLAIN SELECT * FROM t1 WHERE 10 BETWEEN 11 AND 11; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE SELECT * FROM t1 WHERE 10 BETWEEN 11 AND 11; pk i4 EXPLAIN SELECT * FROM t1 WHERE 10 BETWEEN 100 AND 0; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE SELECT * FROM t1 WHERE 10 BETWEEN 100 AND 0; pk i4 EXPLAIN SELECT * FROM t1 WHERE i4 BETWEEN 100 AND 0; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables SELECT * FROM t1 WHERE i4 BETWEEN 100 AND 0; pk i4 EXPLAIN SELECT * FROM t1 WHERE i4 BETWEEN 10 AND 99999999999999999; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range i4_uq i4_uq 5 NULL 3 Using index condition; Using MRR SELECT * FROM t1 WHERE i4 BETWEEN 10 AND 99999999999999999; pk i4 1 10 2 20 3 30 EXPLAIN SELECT * FROM t1 WHERE i4 BETWEEN 999999999999999 AND 30; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables SELECT * FROM t1 WHERE i4 BETWEEN 999999999999999 AND 30; pk i4 EXPLAIN SELECT * FROM t1 WHERE i4 BETWEEN 10 AND '20'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range i4_uq i4_uq 5 NULL 1 Using index condition; Using MRR SELECT * FROM t1 WHERE i4 BETWEEN 10 AND '20'; pk i4 1 10 2 20 EXPLAIN SELECT * FROM t1, t1 as t2 WHERE t2.pk BETWEEN t1.i4 AND t1.i4; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL i4_uq NULL NULL NULL 3 NULL 1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.i4 1 Using index condition SELECT * FROM t1, t1 as t2 WHERE t2.pk BETWEEN t1.i4 AND t1.i4; pk i4 pk i4 EXPLAIN SELECT * FROM t1, t1 as t2 WHERE t1.i4 BETWEEN t2.pk AND t2.pk; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL i4_uq NULL NULL NULL 3 NULL 1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.i4 1 Using index condition SELECT * FROM t1, t1 as t2 WHERE t1.i4 BETWEEN t2.pk AND t2.pk; pk i4 pk i4 DROP TABLE t1; # # BUG#13519696 - 62940: SELECT RESULTS VARY WITH VERSION AND # WITH/WITHOUT INDEX RANGE SCAN # create table t1 (id int unsigned not null auto_increment primary key); insert into t1 values (null); insert into t1 select null from t1; insert into t1 select null from t1; insert into t1 select null from t1; insert into t1 select null from t1; insert into t1 select null from t1; insert into t1 select null from t1; insert into t1 select null from t1; insert into t1 select null from t1; create table t2 ( id int unsigned not null auto_increment, val decimal(5,3) not null, primary key (id,val), unique key (val,id), unique key (id)); insert into t2 select null,id*0.0009 from t1; select count(val) from t2 ignore index (val) where val > 0.1155; count(val) 128 select count(val) from t2 force index (val) where val > 0.1155; count(val) 128 drop table t2, t1; # # BUG#13453382 - REGRESSION SINCE 5.1.39, RANGE OPTIMIZER WRONG # RESULTS WITH DECIMAL CONVERSION # create table t1 (a int,b int,c int,primary key (a,c)); insert into t1 values (1,1,2),(1,1,3),(1,1,4); select convert(3, signed integer) > 2.9; convert(3, signed integer) > 2.9 1 select * from t1 force index (primary) where a=1 and c>= 2.9; a b c 1 1 3 1 1 4 select * from t1 ignore index (primary) where a=1 and c>= 2.9; a b c 1 1 3 1 1 4 select * from t1 force index (primary) where a=1 and c> 2.9; a b c 1 1 3 1 1 4 select * from t1 ignore index (primary) where a=1 and c> 2.9; a b c 1 1 3 1 1 4 drop table t1; # # BUG#13463488 - 63437: CHAR & BETWEEN WITH INDEX RETURNS WRONG # RESULT AFTER MYSQL 5.1. # CREATE TABLE t1( F1 CHAR(5) NOT NULL, F2 CHAR(5) NOT NULL, F3 CHAR(5) NOT NULL, PRIMARY KEY(F1), INDEX IDX_F2(F2) ); INSERT INTO t1 VALUES ('A','A','A'),('AA','AA','AA'),('AAA','AAA','AAA'), ('AAAA','AAAA','AAAA'),('AAAAA','AAAAA','AAAAA'); SELECT * FROM t1 WHERE F1 = 'A '; F1 F2 F3 A A A SELECT * FROM t1 IGNORE INDEX(PRIMARY) WHERE F1 = 'A '; F1 F2 F3 A A A SELECT * FROM t1 WHERE F1 >= 'A '; F1 F2 F3 A A A AA AA AA AAA AAA AAA AAAA AAAA AAAA AAAAA AAAAA AAAAA SELECT * FROM t1 WHERE F1 > 'A '; F1 F2 F3 AA AA AA AAA AAA AAA AAAA AAAA AAAA AAAAA AAAAA AAAAA SELECT * FROM t1 WHERE F1 BETWEEN 'A ' AND 'AAAAA'; F1 F2 F3 A A A AA AA AA AAA AAA AAA AAAA AAAA AAAA AAAAA AAAAA AAAAA SELECT * FROM t1 WHERE F2 BETWEEN 'A ' AND 'AAAAA'; F1 F2 F3 A A A AA AA AA AAA AAA AAA AAAA AAAA AAAA AAAAA AAAAA AAAAA SELECT * FROM t1 WHERE F3 BETWEEN 'A ' AND 'AAAAA'; F1 F2 F3 A A A AA AA AA AAA AAA AAA AAAA AAAA AAAA AAAAA AAAAA AAAAA SELECT * FROM t1 IGNORE INDEX(PRIMARY) WHERE F1 BETWEEN 'A ' AND 'AAAAA'; F1 F2 F3 A A A AA AA AA AAA AAA AAA AAAA AAAA AAAA AAAAA AAAAA AAAAA DROP TABLE t1; End of 5.1 tests CREATE TABLE t1 (c1 DECIMAL(10,0),INDEX(c1)); INSERT INTO t1 VALUES (1),(2),(3); SELECT c1 FROM t1 WHERE c1 >= 'A' GROUP BY 1; c1 1 2 3 Warnings: Warning 1366 Incorrect decimal value: 'A' for column 'c1' at row 1 Warning 1292 Truncated incorrect DOUBLE value: 'A' DROP TABLE t1; create table t1 (a int,b int,key (b),key (a),key (b,a)); insert into t1(a,b) values (1,2),(3,4),(5,6),(7,8); create table t2 (c int); insert into t2(c) values (1),(5),(6),(7),(8); select 1 from (select c from t1,t2 where b >= 1 and a <=> c group by 1 limit 1) as d1; 1 1 drop table t1, t2; # # Bug #26106: Wrong plan may be chosen when there are several possible # range and ref accesses # # Note: The fix for this bug has been reverted. The code will no longer # select the optimal plan for the two following test queries. This is # not due to a bug but due to minor differences in range estimates # produced by the storage engine. CREATE TABLE t1( a INT, b INT, KEY k ( a ), KEY l ( a, b ) ); INSERT INTO t1(a) VALUES (1); INSERT INTO t1 VALUES (2,3),(2,3),(2,3),(2,3),(2,3),(2,3),(2,3),(2,3),(2,3),(2,3); INSERT INTO t1 SELECT 3, 4 FROM t1 WHERE a = 2 AND b = 3; INSERT INTO t1 SELECT 4, 1 FROM t1 WHERE a = 2 AND b = 3; ANALYZE TABLE t1; Table Op Msg_type Msg_text test.t1 analyze status OK INSERT INTO t1 VALUES (1, 2); INSERT INTO t1 SELECT a, b FROM t1 WHERE a=1 AND b=2; INSERT INTO t1 SELECT a, b FROM t1 WHERE a=1 AND b=2; INSERT INTO t1 SELECT a, b FROM t1 WHERE a=1 AND b=2; INSERT INTO t1 SELECT a, b FROM t1 WHERE a=1 AND b=2; INSERT INTO t1 SELECT a, b FROM t1 WHERE a=1 AND b=2; INSERT INTO t1 SELECT a, b FROM t1 WHERE a=1 AND b=2; INSERT INTO t1 SELECT a, b FROM t1 WHERE a=1 AND b=2; # This must use range over index l, not k. # Update: Due to patch being reverted and minor differences in # range estimates k is selected. EXPLAIN SELECT * FROM t1 WHERE a = 1 AND b >= 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ref k,l k 5 const 134 Using where CREATE TABLE t2( a INT, b INT, c INT, KEY k ( a ), KEY l ( a, b ), KEY m ( b ), KEY n ( a, c ) ); INSERT INTO t2(a) VALUES (1); INSERT INTO t2 VALUES (2,3,3),(2,3,3),(2,3,3),(2,3,3),(2,3,3), (2,3,3),(2,3,3),(2,3,3),(2,3,3),(2,3,3); INSERT INTO t2 SELECT 3, 4, 4 FROM t2 WHERE a = 2 AND b = 3; INSERT INTO t2 SELECT 4, 1, 1 FROM t2 WHERE a = 2 AND b = 3; ANALYZE TABLE t2; Table Op Msg_type Msg_text test.t2 analyze status OK INSERT INTO t2 VALUES (1, 2, 2); INSERT INTO t2 SELECT a, b, c FROM t2 WHERE a=1 AND b=2; INSERT INTO t2 SELECT a, b, c FROM t2 WHERE a=1 AND b=2; INSERT INTO t2 SELECT a, b, c FROM t2 WHERE a=1 AND b=2; INSERT INTO t2 SELECT a, b, c FROM t2 WHERE a=1 AND b=2; INSERT INTO t2 SELECT a, b, c FROM t2 WHERE a=1 AND b=2; INSERT INTO t2 SELECT a, b, c FROM t2 WHERE a=1 AND b=2; INSERT INTO t2 VALUES (1, 1, 2); # This must use range over index l, not n. # Update: Due to patch being reverted and minor differences in # range estimates k is selected. EXPLAIN SELECT * FROM t2 WHERE a = 1 AND b >= 2 AND c >= 2; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 ref k,l,m,n k 5 const 66 Using where DROP TABLE t1, t2; # # BUG#11765831: 'RANGE ACCESS' MAY INCORRECTLY FILTER # AWAY QUALIFYING ROWS # CREATE TABLE t10( K INT NOT NULL AUTO_INCREMENT, I INT, J INT, PRIMARY KEY(K), KEY(I,J) ); INSERT INTO t10(I,J) VALUES (6,1),(6,2),(6,3),(6,4),(6,5), (6,6),(6,7),(6,8),(6,9),(6,0); CREATE TABLE t100 LIKE t10; INSERT INTO t100(I,J) SELECT X.I, X.K+(10*Y.K) FROM t10 AS X,t10 AS Y; INSERT INTO t100(I,J) VALUES(8,26); EXPLAIN SELECT * FROM t100 WHERE I <> 6 OR (I <> 8 AND J = 5); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t100 range I I 10 NULL 4 Using index condition; Using MRR SELECT * FROM t100 WHERE I <> 6 OR (I <> 8 AND J = 5); K I J 101 8 26 DROP TABLE t10,t100; # # BUG#12698916 - JOIN QUERY GIVES WRONG RESULT AT 2ND EXEC. OR # AFTER FLUSH TABLES [-INT VS NULL] # CREATE TABLE t1 (col_int INT, pk INT) ENGINE=InnoDB STATS_PERSISTENT=0; INSERT INTO t1 VALUES (-100,1),(1,6); CREATE TABLE t2 ( col_int_key INT, col_varchar VARCHAR(100) NOT NULL DEFAULT "DEFAULT", pk INT NOT NULL, PRIMARY KEY (pk), KEY (col_int_key) ) ENGINE=InnoDB STATS_PERSISTENT=0; INSERT INTO t2 VALUES (1,"GOOD",1),(100,"",2),(200,"",3),(300,"",4),(400,"",5),(500,"",8); EXPLAIN SELECT t1.*,t2.* FROM t1 straight_join t2 ON t2.col_int_key = t1.col_int WHERE t2.pk < t1.pk; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where 1 SIMPLE t2 ref PRIMARY,col_int_key col_int_key 5 test.t1.col_int 1 Using index condition SELECT t1.*,t2.* FROM t1 straight_join t2 ON t2.col_int_key = t1.col_int WHERE t2.pk < t1.pk; col_int pk col_int_key col_varchar pk 1 6 1 GOOD 1 # need FLUSH so that InnoDB statistics change and thus plan changes FLUSH TABLES; EXPLAIN SELECT t1.*,t2.* FROM t1 straight_join t2 ON t2.col_int_key = t1.col_int WHERE t2.pk < t1.pk; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 NULL 1 SIMPLE t2 ALL PRIMARY,col_int_key NULL NULL NULL 6 Range checked for each record (index map: 0x3) SELECT t1.*,t2.* FROM t1 straight_join t2 ON t2.col_int_key = t1.col_int WHERE t2.pk < t1.pk; col_int pk col_int_key col_varchar pk 1 6 1 GOOD 1 DROP TABLE t1,t2; # # Bug#12694872 - # VALGRIND: 18,816 BYTES IN 196 BLOCKS ARE DEFINITELY LOST IN UNIQUE::GET # CREATE TABLE t1 ( pk INTEGER AUTO_INCREMENT, col_int_nokey INTEGER NOT NULL, col_int_key INTEGER NOT NULL, col_date_key DATE NOT NULL, col_varchar_key VARCHAR(1) NOT NULL, col_varchar_nokey VARCHAR(1) NOT NULL, PRIMARY KEY (pk), KEY (col_int_key), KEY (col_date_key), KEY (col_varchar_key, col_int_key) ); INSERT INTO t1 ( col_int_key, col_int_nokey, col_date_key, col_varchar_key, col_varchar_nokey ) VALUES (0, 4, '2011-08-25', 'j', 'j'), (8, 6, '2004-09-18', 'v', 'v'), (1, 3, '2009-12-01', 'c', 'c'), (8, 5, '2004-12-17', 'm', 'm'), (9, 3, '2000-03-14', 'd', 'd'), (6, 2, '2006-05-25', 'y', 'y'), (1, 9, '2008-01-23', 't', 't'), (6, 3, '2007-06-18', 'd', 'd'), (2, 8, '2002-10-13', 's', 's'), (4, 1, '1900-01-01', 'r', 'r'), (8, 8, '1959-04-25', 'm', 'm'), (4, 8, '2006-03-09', 'b', 'b'), (4, 5, '2001-06-05', 'x', 'x'), (7, 7, '2006-05-28', 'g', 'g'), (4, 5, '2001-04-19', 'p', 'p'), (1, 1, '1900-01-01', 'q', 'q'), (9, 6, '2004-08-20', 'w', 'w'), (4, 2, '2004-10-10', 'd', 'd'), (8, 9, '2000-04-02', 'e', 'e') ; ALTER TABLE t1 DISABLE KEYS; SELECT table2.col_date_key AS field1, CONCAT ( table2.col_varchar_nokey, table1.col_varchar_nokey ) AS field2 FROM ( t1 AS table1 INNER JOIN t1 AS table2 ON (( table2.pk <> table1.pk ) AND ( table2.pk >= table1.col_int_nokey ) ) ) WHERE ( table1.pk > 226 AND table1.pk < ( 226 + 102 ) OR ( table1.col_int_key > 226 AND table1.col_int_key < ( 226 + 36 ) OR ( table1.col_varchar_key <= 'h' OR table1.col_int_key > 226 AND table1.col_int_key < ( 226 + 227 ) ) ) ) ; field1 field2 1900-01-01 qb 1900-01-01 qc 1900-01-01 qd 1900-01-01 qd 1900-01-01 qd 1900-01-01 qe 1900-01-01 qg 1900-01-01 rb 1900-01-01 rc 1900-01-01 rd 1900-01-01 rd 1900-01-01 rd 1900-01-01 re 1900-01-01 rg 1959-04-25 mb 1959-04-25 mc 1959-04-25 md 1959-04-25 md 1959-04-25 md 1959-04-25 me 1959-04-25 mg 2000-03-14 dc 2000-03-14 dd 2000-03-14 dd 2000-04-02 eb 2000-04-02 ec 2000-04-02 ed 2000-04-02 ed 2000-04-02 ed 2000-04-02 eg 2001-04-19 pb 2001-04-19 pc 2001-04-19 pd 2001-04-19 pd 2001-04-19 pd 2001-04-19 pe 2001-04-19 pg 2001-06-05 xb 2001-06-05 xc 2001-06-05 xd 2001-06-05 xd 2001-06-05 xd 2001-06-05 xe 2001-06-05 xg 2002-10-13 sb 2002-10-13 sc 2002-10-13 sd 2002-10-13 sd 2002-10-13 sd 2002-10-13 se 2002-10-13 sg 2004-08-20 wb 2004-08-20 wc 2004-08-20 wd 2004-08-20 wd 2004-08-20 wd 2004-08-20 we 2004-08-20 wg 2004-09-18 vd 2004-10-10 db 2004-10-10 dc 2004-10-10 dd 2004-10-10 dd 2004-10-10 de 2004-10-10 dg 2004-12-17 mc 2004-12-17 md 2004-12-17 md 2004-12-17 md 2006-03-09 bc 2006-03-09 bd 2006-03-09 bd 2006-03-09 bd 2006-03-09 be 2006-03-09 bg 2006-05-25 yc 2006-05-25 yd 2006-05-25 yd 2006-05-25 yd 2006-05-28 gb 2006-05-28 gc 2006-05-28 gd 2006-05-28 gd 2006-05-28 gd 2006-05-28 ge 2007-06-18 db 2007-06-18 dc 2007-06-18 dd 2007-06-18 dd 2007-06-18 dg 2008-01-23 tc 2008-01-23 td 2008-01-23 td 2008-01-23 td 2008-01-23 tg 2009-12-01 cd 2009-12-01 cd 2009-12-01 cd ALTER TABLE t1 ENABLE KEYS; CREATE TABLE t2 SELECT table2.col_date_key AS field1, CONCAT ( table2.col_varchar_nokey, table1.col_varchar_nokey ) AS field2 FROM ( t1 AS table1 INNER JOIN t1 AS table2 ON (( table2.pk <> table1.pk ) AND ( table2.pk >= table1.col_int_nokey ) ) ) WHERE ( table1.pk > 226 AND table1.pk < ( 226 + 102 ) OR ( table1.col_int_key > 226 AND table1.col_int_key < ( 226 + 36 ) OR ( table1.col_varchar_key <= 'h' OR table1.col_int_key > 226 AND table1.col_int_key < ( 226 + 227 ) ) ) ) ; SELECT * FROM t2 WHERE (field1, field2) IN (SELECT table2.col_date_key AS field1, CONCAT ( table2.col_varchar_nokey, table1.col_varchar_nokey ) AS field2 FROM ( t1 AS table1 INNER JOIN t1 AS table2 ON (( table2.pk <> table1.pk ) AND ( table2.pk >= table1.col_int_nokey ) ) ) WHERE ( table1.pk > 226 AND table1.pk < ( 226 + 102 ) OR ( table1.col_int_key > 226 AND table1.col_int_key < ( 226 + 36 ) OR ( table1.col_varchar_key <= 'h' OR table1.col_int_key > 226 AND table1.col_int_key < ( 226 + 227 ) ) ) ) ); field1 field2 1900-01-01 qb 1900-01-01 qc 1900-01-01 qd 1900-01-01 qd 1900-01-01 qd 1900-01-01 qe 1900-01-01 qg 1900-01-01 rb 1900-01-01 rc 1900-01-01 rd 1900-01-01 rd 1900-01-01 rd 1900-01-01 re 1900-01-01 rg 1959-04-25 mb 1959-04-25 mc 1959-04-25 md 1959-04-25 md 1959-04-25 md 1959-04-25 me 1959-04-25 mg 2000-03-14 dc 2000-03-14 dd 2000-03-14 dd 2000-04-02 eb 2000-04-02 ec 2000-04-02 ed 2000-04-02 ed 2000-04-02 ed 2000-04-02 eg 2001-04-19 pb 2001-04-19 pc 2001-04-19 pd 2001-04-19 pd 2001-04-19 pd 2001-04-19 pe 2001-04-19 pg 2001-06-05 xb 2001-06-05 xc 2001-06-05 xd 2001-06-05 xd 2001-06-05 xd 2001-06-05 xe 2001-06-05 xg 2002-10-13 sb 2002-10-13 sc 2002-10-13 sd 2002-10-13 sd 2002-10-13 sd 2002-10-13 se 2002-10-13 sg 2004-08-20 wb 2004-08-20 wc 2004-08-20 wd 2004-08-20 wd 2004-08-20 wd 2004-08-20 we 2004-08-20 wg 2004-09-18 vd 2004-10-10 db 2004-10-10 dc 2004-10-10 dd 2004-10-10 dd 2004-10-10 de 2004-10-10 dg 2004-12-17 mc 2004-12-17 md 2004-12-17 md 2004-12-17 md 2006-03-09 bc 2006-03-09 bd 2006-03-09 bd 2006-03-09 bd 2006-03-09 be 2006-03-09 bg 2006-05-25 yc 2006-05-25 yd 2006-05-25 yd 2006-05-25 yd 2006-05-28 gb 2006-05-28 gc 2006-05-28 gd 2006-05-28 gd 2006-05-28 gd 2006-05-28 ge 2007-06-18 db 2007-06-18 dc 2007-06-18 dd 2007-06-18 dd 2007-06-18 dg 2008-01-23 tc 2008-01-23 td 2008-01-23 td 2008-01-23 td 2008-01-23 tg 2009-12-01 cd 2009-12-01 cd 2009-12-01 cd DROP TABLE t1, t2; # # BUG#12912171 - ASSERTION FAILED: QUICK->HEAD->READ_SET == # SAVE_READ_SET # CREATE TABLE t1 ( a INT, b INT, c INT, PRIMARY KEY (c,a), KEY (a),KEY (a) ) ENGINE=INNODB PARTITION BY KEY () PARTITIONS 2; Warnings: Note 1831 Duplicate index 'a_2' defined on the table 'test.t1'. This is deprecated and will be disallowed in a future release. INSERT INTO t1 VALUES (1,5,1),(2,4,1),(3,3,1),(4,2,1),(5,1,1); UPDATE t1 SET b = 0, c=1 WHERE a <=>0; SELECT * FROM t1; a b c 1 5 1 2 4 1 3 3 1 4 2 1 5 1 1 DROP TABLE t1; # # BUG#13256446 - ASSERTION QUICK->HEAD->READ_SET == # SAVE_READ_SET' FAILED IN OPT_RANGE.CC:1606 # CREATE TABLE t1 ( f1 INT AUTO_INCREMENT, f2 INT, f3 INT, f4 INT, PRIMARY KEY (f1),KEY(f2) ) ENGINE=INNODB; CREATE ALGORITHM=MERGE VIEW v2 AS SELECT f1,f2,f3,f4 FROM t1 WHERE f2=103; INSERT INTO t1 VALUES (154,0,NULL,0),(0,NULL,9,0), (NULL,102,NULL,3),(0,3,NULL,0), (9,0,NULL,0),(0,9,NULL,157); SELECT * FROM v2; f1 f2 f3 f4 UPDATE v2 SET f4=0, f2=NULL, f1=NULL WHERE f1 > 16 ORDER BY f1; SELECT * FROM v2; f1 f2 f3 f4 DROP TABLE t1; DROP VIEW v2; CREATE TABLE t1 ( f1 INT AUTO_INCREMENT, f2 INT, f3 INT, f4 INT, PRIMARY KEY (f1),KEY(f2) ) ENGINE=INNODB; INSERT INTO t1 VALUES(1,NULL,NULL,0), (2,2,0,3), (9,0,107,18), (10,0,0,0), (231,0,0,0), (232,0,8,0), (234,0,0,NULL), (235,8,0,3); CREATE ALGORITHM=MERGE VIEW v3 AS SELECT f1,f2,f3,f4 FROM t1 WHERE f1<=85 ; SELECT * FROM v3; f1 f2 f3 f4 1 NULL NULL 0 2 2 0 3 9 0 107 18 10 0 0 0 UPDATE v3 SET f3=0, f4=4 WHERE f2=68 ORDER BY f1; SELECT * FROM v3; f1 f2 f3 f4 1 NULL NULL 0 2 2 0 3 9 0 107 18 10 0 0 0 DROP TABLE t1; DROP VIEW v3; # # BUG#13731380: RANGE OPTIMIZER CALLS RECORDS_IN_RANGE() FOR OPEN RANGE # CREATE TABLE t1 (pk INT PRIMARY KEY); INSERT INTO t1 VALUES (1),(3),(5); SELECT * FROM t1 WHERE pk <> 3 OR pk < 4; pk 1 3 5 DROP TABLE t1; # # BUG#13803810: TOO FEW ROWS RETURNED FOR RANGE ACCESS IN # VARCHAR INDEX USING DATETIME VALUE CREATE TABLE t1 (a DATETIME); INSERT INTO t1 VALUES ('2001-01-01 00:00:00'); INSERT INTO t1 VALUES ('2001-01-01 11:22:33'); CREATE TABLE t2 (b VARCHAR(64), KEY (b)); INSERT INTO t2 VALUES ('2001-01-01'); INSERT INTO t2 VALUES ('2001.01.01'); INSERT INTO t2 VALUES ('2001#01#01'); INSERT INTO t2 VALUES ('2001-01-01 00:00:00'); INSERT INTO t2 VALUES ('2001-01-01 11:22:33'); # range/ref access cannot be used for this query EXPLAIN SELECT * FROM t2 WHERE b=CAST('2001-01-01' AS DATE); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index b b 67 NULL 5 Using where; Using index SELECT * FROM t2 WHERE b=CAST('2001-01-01' AS DATE); b 2001#01#01 2001-01-01 2001-01-01 00:00:00 2001.01.01 # range/ref access cannot be used for any of the queries below. # See BUG#13814468 about 'Range checked for each record' EXPLAIN SELECT * FROM t1, t2 WHERE a=b ORDER BY BINARY a, BINARY b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using temporary; Using filesort 1 SIMPLE t2 ALL b NULL NULL NULL 5 Range checked for each record (index map: 0x1) SELECT * FROM t1, t2 WHERE a=b ORDER BY BINARY a, BINARY b; a b 2001-01-01 00:00:00 2001#01#01 2001-01-01 00:00:00 2001-01-01 2001-01-01 00:00:00 2001-01-01 00:00:00 2001-01-01 00:00:00 2001.01.01 2001-01-01 11:22:33 2001-01-01 11:22:33 EXPLAIN SELECT * FROM t1, t2 WHERE b=a ORDER BY BINARY a, BINARY b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using temporary; Using filesort 1 SIMPLE t2 ALL b NULL NULL NULL 5 Range checked for each record (index map: 0x1) SELECT * FROM t1, t2 WHERE b=a ORDER BY BINARY a, BINARY b; a b 2001-01-01 00:00:00 2001#01#01 2001-01-01 00:00:00 2001-01-01 2001-01-01 00:00:00 2001-01-01 00:00:00 2001-01-01 00:00:00 2001.01.01 2001-01-01 11:22:33 2001-01-01 11:22:33 DROP TABLE t1,t2; # # Bug #20229614: OR CONDITIONS ON MULTI-COLUMN INDEX MAY NOT USE ALL # INDEX COLUMNS TO FILTER ROWS # CREATE TABLE t1 ( c1 INT, c2 INT, c3 INT, PRIMARY KEY(c1, c2, c3) ) ENGINE=INNODB; INSERT INTO t1 VALUES (1, 1, 1), (1, 1, 2), (1, 1, 3), (1, 1, 4), (1, 1, 5); INSERT INTO t1 SELECT c1, 2, c3 FROM t1; INSERT INTO t1 SELECT c1, 3, c3 FROM t1 WHERE c2 = 1; SELECT COUNT(*) FROM t1; COUNT(*) 15 EXPLAIN SELECT c1, c2, c3 FROM t1 WHERE (c1 = 1 AND c2 = 1 AND c3 = 1) OR (c1 = 1 AND c2 = 2 AND c3 = 2) OR (c1 = 1 AND c2 = 2 AND c3 = 3); id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range PRIMARY PRIMARY 12 NULL 3 Using where; Using index DROP TABLE t1; # # Bug#21139683: ASSERTION FAILED: TYPE_ARG == MAYBE_KEY || # TYPE_ARG == IMPOSSIBLE # CREATE TABLE t1 ( a BLOB, PRIMARY KEY(a(1)), KEY(a(1)) ) ENGINE=INNODB; SELECT 1 FROM t1 WHERE a <> 'a' OR a <> ""; 1 DROP TABLE t1; # # Bug #23259872: OPTIMIZER CHOOSES TO USE NON PRIMARY # INDEX, EVEN THOUGH COST IS HIGHER # CREATE TABLE `giant_table` ( `id` int(11) NOT NULL AUTO_INCREMENT, `one_id` int(11) NOT NULL, `other_id` bigint(20) NOT NULL DEFAULT '0', `some_other_id` int(11) DEFAULT 0 NOT NULL, `something` double NOT NULL DEFAULT '0', `comment` text COLLATE utf8_unicode_ci, `flags` int(11) NOT NULL DEFAULT '0', `time_created` int(11) NOT NULL DEFAULT '0', PRIMARY KEY (`id`), KEY `time_created` (`time_created`), KEY `some_other_id` (`some_other_id`), KEY `one_other_idx` (`one_id`,`other_id`), KEY `other_id` (`other_id`,`time_created`) ) ENGINE=InnoDB AUTO_INCREMENT=101651329 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci ; CREATE TABLE t1 (c1 INT); INSERT INTO t1 VALUES (66136540), (68983250), (89627210), (77869520), (82543190), (67538270), (77282760), (77908170), (70923370), (68066360); CREATE PROCEDURE p() BEGIN SET @x = 1; REPEAT INSERT INTO giant_table(id,one_id) SELECT c1 + @x, 0 FROM t1 WHERE c1 IN (66136540, 68985250, 89627210, 77869520 , 82543190, 67538270, 77282760, 77908170, 70923370, 68066360); SET @x = @x + 1; UNTIL @x > 30 END REPEAT; END $ CALL p(); SELECT count(*) FROM giant_table; count(*) 270 INSERT INTO giant_table (id,one_id) VALUES (66136539, 0), (68983258,1), (89628210,1), (77869520,2); INSERT INTO giant_table (id,one_id, some_other_id) VALUES(84673401, 0, 1), (61069031, 1, 1); EXPLAIN SELECT id, something, comment, time_created, one_id, other_id, some_other_id, flags FROM giant_table WHERE id IN (66136539, 68983258, 89628210, 77869520, 82543198, 67538272, 84673401, 61069031, 68214385, 77282865, 76991297, 64569216, 89481638, 74534074, 70396537, 80076375, 63308530, 77908270, 70923271, 68066180) AND (giant_table.flags & 0x01) = 0 AND giant_table.some_other_id = 0; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE giant_table range PRIMARY,some_other_id some_other_id 8 NULL 20 Using index condition; Using where; Using MRR DROP PROCEDURE p; DROP TABLE giant_table, t1; set optimizer_switch=default;