set global innodb_support_xa=default; set session innodb_support_xa=default; SET SESSION STORAGE_ENGINE = InnoDB; drop table if exists t1,t2,t3,t1m,t1i,t2m,t2i,t4; drop procedure if exists p1; create table t1 ( c_id int(11) not null default '0', org_id int(11) default null, unique key contacts$c_id (c_id), key contacts$org_id (org_id) ); insert into t1 values (2,null),(120,null),(141,null),(218,7), (128,1), (151,2),(234,2),(236,2),(243,2),(255,2),(259,2),(232,3),(235,3),(238,3), (246,3),(253,3),(269,3),(285,3),(291,3),(293,3),(131,4),(230,4),(231,4); create table t2 ( slai_id int(11) not null default '0', owner_tbl int(11) default null, owner_id int(11) default null, sla_id int(11) default null, inc_web int(11) default null, inc_email int(11) default null, inc_chat int(11) default null, inc_csr int(11) default null, inc_total int(11) default null, time_billed int(11) default null, activedate timestamp null default null, expiredate timestamp null default null, state int(11) default null, sla_set int(11) default null, unique key t2$slai_id (slai_id), key t2$owner_id (owner_id), key t2$sla_id (sla_id) ); insert into t2(slai_id, owner_tbl, owner_id, sla_id) values (1,3,1,1), (3,3,10,2), (4,3,3,6), (5,3,2,5), (6,3,8,3), (7,3,9,7), (8,3,6,8), (9,3,4,9), (10,3,5,10), (11,3,11,11), (12,3,7,12); flush tables; select si.slai_id from t1 c join t2 si on ((si.owner_tbl = 3 and si.owner_id = c.org_id) or ( si.owner_tbl = 2 and si.owner_id = c.c_id)) where c.c_id = 218 and expiredate is null; slai_id 12 select * from t1 where org_id is null; c_id org_id 2 NULL 120 NULL 141 NULL select si.slai_id from t1 c join t2 si on ((si.owner_tbl = 3 and si.owner_id = c.org_id) or ( si.owner_tbl = 2 and si.owner_id = c.c_id)) where c.c_id = 218 and expiredate is null; slai_id 12 drop table t1, t2; CREATE TABLE t1 (a int, b int, KEY b (b)); CREATE TABLE t2 (a int, b int, PRIMARY KEY (a,b)); CREATE TABLE t3 (a int, b int, c int, PRIMARY KEY (a), UNIQUE KEY b (b,c), KEY a (a,b,c)); INSERT INTO t1 VALUES (1, 1); INSERT INTO t1 SELECT a + 1, b + 1 FROM t1; INSERT INTO t1 SELECT a + 2, b + 2 FROM t1; INSERT INTO t2 VALUES (1,1),(1,2),(1,3),(1,4),(1,5),(1,6),(1,7),(1,8); INSERT INTO t2 SELECT a + 1, b FROM t2; DELETE FROM t2 WHERE a = 1 AND b < 2; INSERT INTO t3 VALUES (1,1,1),(2,1,2); INSERT INTO t3 SELECT a + 2, a + 2, 3 FROM t3; INSERT INTO t3 SELECT a + 4, a + 4, 3 FROM t3; SELECT STRAIGHT_JOIN SQL_NO_CACHE t1.b, t1.a FROM t1, t3, t2 WHERE t3.a = t2.a AND t2.b = t1.a AND t3.b = 1 AND t3.c IN (1, 2) ORDER BY t1.b LIMIT 2; b a 1 1 2 2 SELECT STRAIGHT_JOIN SQL_NO_CACHE t1.b, t1.a FROM t1, t3, t2 WHERE t3.a = t2.a AND t2.b = t1.a AND t3.b = 1 AND t3.c IN (1, 2) ORDER BY t1.b LIMIT 5; b a 1 1 2 2 2 2 3 3 3 3 DROP TABLE t1, t2, t3; CREATE TABLE `t1` (`id1` INT) ; INSERT INTO `t1` (`id1`) VALUES (1),(5),(2); CREATE TABLE `t2` ( `id1` INT, `id2` INT NOT NULL, `id3` INT, `id4` INT NOT NULL, UNIQUE (`id2`,`id4`), KEY (`id1`) ); INSERT INTO `t2`(`id1`,`id2`,`id3`,`id4`) VALUES (1,1,1,0), (1,1,2,1), (5,1,2,2), (6,1,2,3), (1,2,2,2), (1,2,1,1); SELECT `id1` FROM `t1` WHERE `id1` NOT IN (SELECT `id1` FROM `t2` WHERE `id2` = 1 AND `id3` = 2); id1 2 DROP TABLE t1, t2; create table t1 (c1 int) engine=innodb; handler t1 open; handler t1 read first; c1 Before and after comparison 0 drop table t1; CREATE TABLE t1(c1 TEXT, UNIQUE (c1(1)), cnt INT DEFAULT 1) ENGINE=INNODB CHARACTER SET UTF8; INSERT INTO t1 (c1) VALUES ('1a'); SELECT * FROM t1; c1 cnt 1a 1 INSERT INTO t1 (c1) VALUES ('1b') ON DUPLICATE KEY UPDATE cnt=cnt+1; SELECT * FROM t1; c1 cnt 1a 2 DROP TABLE t1; CREATE TABLE t1(c1 VARCHAR(2), UNIQUE (c1(1)), cnt INT DEFAULT 1) ENGINE=INNODB CHARACTER SET UTF8; INSERT INTO t1 (c1) VALUES ('1a'); SELECT * FROM t1; c1 cnt 1a 1 INSERT INTO t1 (c1) VALUES ('1b') ON DUPLICATE KEY UPDATE cnt=cnt+1; SELECT * FROM t1; c1 cnt 1a 2 DROP TABLE t1; CREATE TABLE t1(c1 CHAR(2), UNIQUE (c1(1)), cnt INT DEFAULT 1) ENGINE=INNODB CHARACTER SET UTF8; INSERT INTO t1 (c1) VALUES ('1a'); SELECT * FROM t1; c1 cnt 1a 1 INSERT INTO t1 (c1) VALUES ('1b') ON DUPLICATE KEY UPDATE cnt=cnt+1; SELECT * FROM t1; c1 cnt 1a 2 DROP TABLE t1; CREATE TABLE t1 ( a1 decimal(10,0) DEFAULT NULL, a2 blob, a3 time DEFAULT NULL, a4 blob, a5 char(175) DEFAULT NULL, a6 timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', a7 tinyblob, INDEX idx (a6,a7(239),a5) ) ENGINE=InnoDB; EXPLAIN SELECT a4 FROM t1 WHERE a6=NULL AND a4='UNcT5pIde4I6c2SheTo4gt92OV1jgJCVkXmzyf325R1DwLURkbYHwhydANIZMbKTgdcR5xS'; 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 EXPLAIN SELECT t1.a4 FROM t1, t1 t WHERE t.a6=t.a6 AND t1.a6=NULL AND t1.a4='UNcT5pIde4I6c2SheTo4gt92OV1jgJCVkXmzyf325R1DwLURkbYHwhydANIZMbKTgdcR5xS'; 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 DROP TABLE t1; create table t1m (a int) engine = MEMORY; create table t1i (a int); create table t2m (a int) engine = MEMORY; create table t2i (a int); insert into t2m values (5); insert into t2i values (5); select min(a) from t1i; min(a) NULL select min(7) from t1i; min(7) NULL select min(7) from DUAL; min(7) 7 explain select min(7) from t2i join t1i; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2i ALL NULL NULL NULL NULL 1 1 SIMPLE t1i ALL NULL NULL NULL NULL 1 Using join buffer select min(7) from t2i join t1i; min(7) NULL select max(a) from t1i; max(a) NULL select max(7) from t1i; max(7) NULL select max(7) from DUAL; max(7) 7 explain select max(7) from t2i join t1i; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2i ALL NULL NULL NULL NULL 1 1 SIMPLE t1i ALL NULL NULL NULL NULL 1 Using join buffer select max(7) from t2i join t1i; max(7) NULL select 1, min(a) from t1i where a=99; 1 min(a) 1 NULL select 1, min(a) from t1i where 1=99; 1 min(a) 1 NULL select 1, min(1) from t1i where a=99; 1 min(1) 1 NULL select 1, min(1) from t1i where 1=99; 1 min(1) 1 NULL select 1, max(a) from t1i where a=99; 1 max(a) 1 NULL select 1, max(a) from t1i where 1=99; 1 max(a) 1 NULL select 1, max(1) from t1i where a=99; 1 max(1) 1 NULL select 1, max(1) from t1i where 1=99; 1 max(1) 1 NULL explain select count(*), min(7), max(7) from t1m, t1i; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1m system NULL NULL NULL NULL 0 const row not found 1 SIMPLE t1i ALL NULL NULL NULL NULL 1 select count(*), min(7), max(7) from t1m, t1i; count(*) min(7) max(7) 0 NULL NULL explain select count(*), min(7), max(7) from t1m, t2i; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1m system NULL NULL NULL NULL 0 const row not found 1 SIMPLE t2i ALL NULL NULL NULL NULL 1 select count(*), min(7), max(7) from t1m, t2i; count(*) min(7) max(7) 0 NULL NULL explain select count(*), min(7), max(7) from t2m, t1i; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2m system NULL NULL NULL NULL 1 1 SIMPLE t1i ALL NULL NULL NULL NULL 1 select count(*), min(7), max(7) from t2m, t1i; count(*) min(7) max(7) 0 NULL NULL drop table t1m, t1i, t2m, t2i; create table t1 ( a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(64) default ' ' ) ENGINE = MEMORY; insert into t1 (a1, a2, b, c, d) values ('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'), ('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'), ('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'), ('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'), ('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'), ('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'), ('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'), ('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'), ('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'), ('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'), ('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'), ('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'), ('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'), ('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'), ('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'), ('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4'), ('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'), ('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'), ('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'), ('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'), ('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'), ('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'), ('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'), ('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'), ('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'), ('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'), ('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'), ('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'), ('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'), ('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'), ('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'), ('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4'); create table t4 ( pk_col int auto_increment primary key, a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(64) default ' ' ); insert into t4 (a1, a2, b, c, d, dummy) select * from t1; create index idx12672_0 on t4 (a1); create index idx12672_1 on t4 (a1,a2,b,c); create index idx12672_2 on t4 (a1,a2,b); analyze table t4; Table Op Msg_type Msg_text test.t4 analyze status OK select distinct a1 from t4 where pk_col not in (1,2,3,4); a1 a b c d drop table t1,t4; DROP TABLE IF EXISTS t2, t1; CREATE TABLE t1 (i INT NOT NULL PRIMARY KEY) ENGINE= InnoDB; CREATE TABLE t2 ( i INT NOT NULL, FOREIGN KEY (i) REFERENCES t1 (i) ON DELETE NO ACTION ) ENGINE= InnoDB; INSERT INTO t1 VALUES (1); INSERT INTO t2 VALUES (1); DELETE IGNORE FROM t1 WHERE i = 1; Warnings: Error 1451 Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`i`) REFERENCES `t1` (`i`) ON DELETE NO ACTION) SELECT * FROM t1, t2; i i 1 1 DROP TABLE t2, t1; End of 4.1 tests. create table t1 ( a varchar(30), b varchar(30), primary key(a), key(b) ); select distinct a from t1; a drop table t1; create table t1(a int, key(a)); insert into t1 values(1); select a, count(a) from t1 group by a with rollup; a count(a) 1 1 NULL 1 drop table t1; create table t1 (f1 int, f2 char(1), primary key(f1,f2)); insert into t1 values ( 1,"e"),(2,"a"),( 3,"c"),(4,"d"); alter table t1 drop primary key, add primary key (f2, f1); explain select distinct f1 a, f1 b from t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL PRIMARY 5 NULL 4 Using index; Using temporary explain select distinct f1, f2 from t1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range NULL PRIMARY 5 NULL 3 Using index for group-by; Using temporary drop table t1; CREATE TABLE t1 (id int(11) NOT NULL PRIMARY KEY, name varchar(20), INDEX (name)); CREATE TABLE t2 (id int(11) NOT NULL PRIMARY KEY, fkey int(11)); ALTER TABLE t2 ADD FOREIGN KEY (fkey) REFERENCES t2(id); INSERT INTO t1 VALUES (1,'A1'),(2,'A2'),(3,'B'); INSERT INTO t2 VALUES (1,1),(2,2),(3,2),(4,3),(5,3); EXPLAIN SELECT COUNT(*) FROM t2 LEFT JOIN t1 ON t2.fkey = t1.id WHERE t1.name LIKE 'A%'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index PRIMARY,name name 23 NULL 3 Using where; Using index 1 SIMPLE t2 ref fkey fkey 5 test.t1.id 1 Using where; Using index EXPLAIN SELECT COUNT(*) FROM t2 LEFT JOIN t1 ON t2.fkey = t1.id WHERE t1.name LIKE 'A%' OR FALSE; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index NULL fkey 5 NULL 5 Using index 1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.fkey 1 Using where DROP TABLE t1,t2; CREATE TABLE t1 ( id int NOT NULL, name varchar(20) NOT NULL, dept varchar(20) NOT NULL, age tinyint(3) unsigned NOT NULL, PRIMARY KEY (id), INDEX (name,dept) ) ENGINE=InnoDB; INSERT INTO t1(id, dept, age, name) VALUES (3987, 'cs1', 10, 'rs1'), (3988, 'cs2', 20, 'rs1'), (3995, 'cs3', 10, 'rs2'), (3996, 'cs4', 20, 'rs2'), (4003, 'cs5', 10, 'rs3'), (4004, 'cs6', 20, 'rs3'), (4011, 'cs7', 10, 'rs4'), (4012, 'cs8', 20, 'rs4'), (4019, 'cs9', 10, 'rs5'), (4020, 'cs10', 20, 'rs5'),(4027, 'cs11', 10, 'rs6'),(4028, 'cs12', 20, 'rs6'); EXPLAIN SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range name name 44 NULL 2 Using where; Using index for group-by SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5'; name dept rs5 cs10 rs5 cs9 DELETE FROM t1; EXPLAIN SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5'; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range name name 44 NULL 2 Using where; Using index for group-by SELECT DISTINCT t1.name, t1.dept FROM t1 WHERE t1.name='rs5'; name dept DROP TABLE t1; drop table if exists t1; show variables like 'innodb_rollback_on_timeout'; Variable_name Value innodb_rollback_on_timeout OFF create table t1 (a int unsigned not null primary key) engine = innodb; insert into t1 values (1); commit; begin work; insert into t1 values (2); select * from t1; a 1 2 begin work; insert into t1 values (5); select * from t1; a 1 5 insert into t1 values (2); ERROR HY000: Lock wait timeout exceeded; try restarting transaction select * from t1; a 1 5 commit; select * from t1; a 1 2 commit; select * from t1; a 1 2 5 drop table t1; set @save_qcache_size=@@global.query_cache_size; set @save_qcache_type=@@global.query_cache_type; set global query_cache_size=10*1024*1024; set global query_cache_type=1; drop table if exists `test`; Warnings: Note 1051 Unknown table 'test' CREATE TABLE `test` (`test1` varchar(3) NOT NULL, `test2` varchar(4) NOT NULL,PRIMARY KEY (`test1`)) ENGINE=InnoDB DEFAULT CHARSET=latin1; INSERT INTO `test` (`test1`, `test2`) VALUES ('tes', '5678'); select * from test; test1 test2 tes 5678 INSERT INTO `test` (`test1`, `test2`) VALUES ('tes', '1234') ON DUPLICATE KEY UPDATE `test2` = '1234'; select * from test; test1 test2 tes 1234 flush tables; select * from test; test1 test2 tes 1234 drop table test; set global query_cache_type=@save_qcache_type; set global query_cache_size=@save_qcache_size; drop table if exists t1; show variables like 'innodb_rollback_on_timeout'; Variable_name Value innodb_rollback_on_timeout OFF create table t1 (a int unsigned not null primary key) engine = innodb; insert into t1 values (1); commit; begin work; insert into t1 values (2); select * from t1; a 1 2 begin work; insert into t1 values (5); select * from t1; a 1 5 insert into t1 values (2); ERROR HY000: Lock wait timeout exceeded; try restarting transaction select * from t1; a 1 5 commit; select * from t1; a 1 2 commit; select * from t1; a 1 2 5 drop table t1; create table t1( id int auto_increment, c char(1) not null, counter int not null default 1, primary key (id), unique key (c) ) engine=innodb; insert into t1 (id, c) values (NULL, 'a'), (NULL, 'a') on duplicate key update id = values(id), counter = counter + 1; select * from t1; id c counter 2 a 2 insert into t1 (id, c) values (NULL, 'b') on duplicate key update id = values(id), counter = counter + 1; select * from t1; id c counter 2 a 2 3 b 1 truncate table t1; insert into t1 (id, c) values (NULL, 'a'); select * from t1; id c counter 1 a 1 insert into t1 (id, c) values (NULL, 'b'), (NULL, 'b') on duplicate key update id = values(id), c = values(c), counter = counter + 1; select * from t1; id c counter 1 a 1 3 b 2 insert into t1 (id, c) values (NULL, 'a') on duplicate key update id = values(id), c = values(c), counter = counter + 1; select * from t1; id c counter 3 b 2 4 a 2 drop table t1; CREATE TABLE t1( id int AUTO_INCREMENT PRIMARY KEY, stat_id int NOT NULL, acct_id int DEFAULT NULL, INDEX idx1 (stat_id, acct_id), INDEX idx2 (acct_id) ) ENGINE=MyISAM; CREATE TABLE t2( id int AUTO_INCREMENT PRIMARY KEY, stat_id int NOT NULL, acct_id int DEFAULT NULL, INDEX idx1 (stat_id, acct_id), INDEX idx2 (acct_id) ) ENGINE=InnoDB; INSERT INTO t1(stat_id,acct_id) VALUES (1,759), (2,831), (3,785), (4,854), (1,921), (1,553), (2,589), (3,743), (2,827), (2,545), (4,779), (4,783), (1,597), (1,785), (4,832), (1,741), (1,833), (3,788), (2,973), (1,907); INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1; INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1; INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1; INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1; INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1; INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1; INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1; INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1; INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1; INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1; INSERT INTO t1(stat_id,acct_id) SELECT stat_id, mod(id+100000, acct_id) FROM t1; UPDATE t1 SET acct_id=785 WHERE MOD(stat_id,2)=0 AND MOD(id,stat_id)=MOD(acct_id,stat_id); OPTIMIZE TABLE t1; Table Op Msg_type Msg_text test.t1 optimize status OK SELECT COUNT(*) FROM t1; COUNT(*) 40960 SELECT COUNT(*) FROM t1 WHERE acct_id=785; COUNT(*) 8702 EXPLAIN SELECT COUNT(*) FROM t1 WHERE stat_id IN (1,3) AND acct_id=785; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 range idx1,idx2 idx1 9 NULL 2 Using where; Using index INSERT INTO t2 SELECT * FROM t1; OPTIMIZE TABLE t2; Table Op Msg_type Msg_text test.t2 optimize note Table does not support optimize, doing recreate + analyze instead test.t2 optimize status OK EXPLAIN SELECT COUNT(*) FROM t2 WHERE stat_id IN (1,3) AND acct_id=785; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 range idx1,idx2 idx1 9 NULL 2 Using where; Using index DROP TABLE t1,t2; create table t1(a int) engine=innodb; alter table t1 comment '123'; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` int(11) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='123' drop table t1; CREATE TABLE t1 (a CHAR(2), KEY (a)) ENGINE = InnoDB DEFAULT CHARSET=UTF8; INSERT INTO t1 VALUES ('uk'),('bg'); SELECT * FROM t1 WHERE a = 'uk'; a uk DELETE FROM t1 WHERE a = 'uk'; SELECT * FROM t1 WHERE a = 'uk'; a UPDATE t1 SET a = 'us' WHERE a = 'uk'; SELECT * FROM t1 WHERE a = 'uk'; a CREATE TABLE t2 (a CHAR(2), KEY (a)) ENGINE = InnoDB; INSERT INTO t2 VALUES ('uk'),('bg'); SELECT * FROM t2 WHERE a = 'uk'; a uk DELETE FROM t2 WHERE a = 'uk'; SELECT * FROM t2 WHERE a = 'uk'; a INSERT INTO t2 VALUES ('uk'); UPDATE t2 SET a = 'us' WHERE a = 'uk'; SELECT * FROM t2 WHERE a = 'uk'; a CREATE TABLE t3 (a CHAR(2), KEY (a)) ENGINE = MyISAM; INSERT INTO t3 VALUES ('uk'),('bg'); SELECT * FROM t3 WHERE a = 'uk'; a uk DELETE FROM t3 WHERE a = 'uk'; SELECT * FROM t3 WHERE a = 'uk'; a INSERT INTO t3 VALUES ('uk'); UPDATE t3 SET a = 'us' WHERE a = 'uk'; SELECT * FROM t3 WHERE a = 'uk'; a DROP TABLE t1,t2,t3; create table t1 (a int) engine=innodb; select * from bug29807; ERROR 42S02: Table 'test.bug29807' doesn't exist drop table t1; drop table bug29807; ERROR 42S02: Unknown table 'bug29807' create table bug29807 (a int); drop table bug29807; CREATE TABLE t1 (a INT) ENGINE=InnoDB; CREATE TABLE t2 (a INT) ENGINE=InnoDB; switch to connection c1 SET AUTOCOMMIT=0; INSERT INTO t2 VALUES (1); switch to connection c2 SET AUTOCOMMIT=0; LOCK TABLES t1 READ, t2 READ; ERROR HY000: Lock wait timeout exceeded; try restarting transaction switch to connection c1 COMMIT; INSERT INTO t1 VALUES (1); switch to connection default SET AUTOCOMMIT=default; DROP TABLE t1,t2; CREATE TABLE t1 ( id int NOT NULL auto_increment PRIMARY KEY, b int NOT NULL, c datetime NOT NULL, INDEX idx_b(b), INDEX idx_c(c) ) ENGINE=InnoDB; CREATE TABLE t2 ( b int NOT NULL auto_increment PRIMARY KEY, c datetime NOT NULL ) ENGINE= MyISAM; INSERT INTO t2(c) VALUES ('2007-01-01'); INSERT INTO t2(c) SELECT c FROM t2; INSERT INTO t2(c) SELECT c FROM t2; INSERT INTO t2(c) SELECT c FROM t2; INSERT INTO t2(c) SELECT c FROM t2; INSERT INTO t2(c) SELECT c FROM t2; INSERT INTO t2(c) SELECT c FROM t2; INSERT INTO t2(c) SELECT c FROM t2; INSERT INTO t2(c) SELECT c FROM t2; INSERT INTO t2(c) SELECT c FROM t2; INSERT INTO t2(c) SELECT c FROM t2; INSERT INTO t1(b,c) SELECT b,c FROM t2; UPDATE t2 SET c='2007-01-02'; INSERT INTO t1(b,c) SELECT b,c FROM t2; UPDATE t2 SET c='2007-01-03'; INSERT INTO t1(b,c) SELECT b,c FROM t2; set @@sort_buffer_size=8192; Warnings: Warning 1292 Truncated incorrect sort_buffer_size value: '8192' SELECT COUNT(*) FROM t1; COUNT(*) 3072 EXPLAIN SELECT COUNT(*) FROM t1 WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL idx_b,idx_c NULL NULL NULL # Using where SELECT COUNT(*) FROM t1 WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1; COUNT(*) 3072 EXPLAIN SELECT COUNT(*) FROM t1 FORCE INDEX(idx_b, idx_c) WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index_merge idx_b,idx_c idx_c,idx_b 8,4 NULL # Using sort_union(idx_c,idx_b); Using where SELECT COUNT(*) FROM t1 FORCE INDEX(idx_b, idx_c) WHERE (c >= '2007-01-02' AND c <= '2007-01-03') OR b >= 1; COUNT(*) 3072 set @@sort_buffer_size=default; DROP TABLE t1,t2; CREATE TABLE t1 (a int, b int); insert into t1 values (1,1),(1,2); CREATE TABLE t2 (primary key (a)) select * from t1; ERROR 23000: Duplicate entry '1' for key 'PRIMARY' drop table if exists t2; Warnings: Note 1051 Unknown table 't2' CREATE TEMPORARY TABLE t2 (primary key (a)) select * from t1; ERROR 23000: Duplicate entry '1' for key 'PRIMARY' drop table if exists t2; Warnings: Note 1051 Unknown table 't2' CREATE TABLE t2 (a int, b int, primary key (a)); BEGIN; INSERT INTO t2 values(100,100); CREATE TABLE IF NOT EXISTS t2 (primary key (a)) select * from t1; ERROR 23000: Duplicate entry '1' for key 'PRIMARY' SELECT * from t2; a b 100 100 ROLLBACK; SELECT * from t2; a b 100 100 TRUNCATE table t2; INSERT INTO t2 select * from t1; ERROR 23000: Duplicate entry '1' for key 'PRIMARY' SELECT * from t2; a b drop table t2; CREATE TEMPORARY TABLE t2 (a int, b int, primary key (a)); BEGIN; INSERT INTO t2 values(100,100); CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) select * from t1; ERROR 23000: Duplicate entry '1' for key 'PRIMARY' SELECT * from t2; a b 100 100 COMMIT; BEGIN; INSERT INTO t2 values(101,101); CREATE TEMPORARY TABLE IF NOT EXISTS t2 (primary key (a)) select * from t1; ERROR 23000: Duplicate entry '1' for key 'PRIMARY' SELECT * from t2; a b 100 100 101 101 ROLLBACK; SELECT * from t2; a b 100 100 TRUNCATE table t2; INSERT INTO t2 select * from t1; ERROR 23000: Duplicate entry '1' for key 'PRIMARY' SELECT * from t2; a b drop table t1,t2; create table t1(f1 varchar(800) binary not null, key(f1)) character set utf8 collate utf8_general_ci; Warnings: Warning 1071 Specified key was too long; max key length is 767 bytes insert into t1 values('aaa'); drop table t1; CREATE TABLE t1 (a INT PRIMARY KEY, b INT, c FLOAT, KEY b(b)) ENGINE = INNODB; INSERT INTO t1 VALUES ( 1 , 1 , 1); INSERT INTO t1 SELECT a + 1 , MOD(a + 1 , 20), 1 FROM t1; INSERT INTO t1 SELECT a + 2 , MOD(a + 2 , 20), 1 FROM t1; INSERT INTO t1 SELECT a + 4 , MOD(a + 4 , 20), 1 FROM t1; INSERT INTO t1 SELECT a + 8 , MOD(a + 8 , 20), 1 FROM t1; INSERT INTO t1 SELECT a + 16, MOD(a + 16, 20), 1 FROM t1; INSERT INTO t1 SELECT a + 32, MOD(a + 32, 20), 1 FROM t1; INSERT INTO t1 SELECT a + 64, MOD(a + 64, 20), 1 FROM t1; EXPLAIN SELECT b, SUM(c) FROM t1 GROUP BY b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL b 5 NULL 128 EXPLAIN SELECT SQL_BIG_RESULT b, SUM(c) FROM t1 GROUP BY b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 128 Using filesort DROP TABLE t1; drop table if exists t1; show variables like 'innodb_rollback_on_timeout'; Variable_name Value innodb_rollback_on_timeout OFF create table t1 (a int unsigned not null primary key) engine = innodb; insert into t1 values (1); commit; begin work; insert into t1 values (2); select * from t1; a 1 2 begin work; insert into t1 values (5); select * from t1; a 1 5 insert into t1 values (2); ERROR HY000: Lock wait timeout exceeded; try restarting transaction select * from t1; a 1 5 commit; select * from t1; a 1 2 commit; select * from t1; a 1 2 5 drop table t1; drop table if exists t1; create table t1 (a int) engine=innodb; alter table t1 alter a set default 1; drop table t1; Bug#24918 drop table and lock / inconsistent between perm and temp tables Check transactional tables under LOCK TABLES drop table if exists t24918, t24918_tmp, t24918_trans, t24918_trans_tmp, t24918_access; create table t24918_access (id int); create table t24918 (id int) engine=myisam; create temporary table t24918_tmp (id int) engine=myisam; create table t24918_trans (id int) engine=innodb; create temporary table t24918_trans_tmp (id int) engine=innodb; lock table t24918 write, t24918_tmp write, t24918_trans write, t24918_trans_tmp write; drop table t24918; select * from t24918_access; ERROR HY000: Table 't24918_access' was not locked with LOCK TABLES drop table t24918_trans; select * from t24918_access; ERROR HY000: Table 't24918_access' was not locked with LOCK TABLES drop table t24918_trans_tmp; select * from t24918_access; ERROR HY000: Table 't24918_access' was not locked with LOCK TABLES drop table t24918_tmp; select * from t24918_access; ERROR HY000: Table 't24918_access' was not locked with LOCK TABLES unlock tables; drop table t24918_access; CREATE TABLE t1 (a int, b int, PRIMARY KEY (a), KEY bkey (b)) ENGINE=InnoDB; INSERT INTO t1 VALUES (1,2),(3,2),(2,2),(4,2),(5,2),(6,2),(7,2),(8,2); INSERT INTO t1 SELECT a + 8, 2 FROM t1; INSERT INTO t1 SELECT a + 16, 1 FROM t1; EXPLAIN SELECT * FROM t1 WHERE b=2 ORDER BY a; id 1 select_type SIMPLE table t1 type ref possible_keys bkey key bkey key_len 5 ref const rows 16 Extra Using where; Using index SELECT * FROM t1 WHERE b=2 ORDER BY a; a b 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 2 12 2 13 2 14 2 15 2 16 2 EXPLAIN SELECT * FROM t1 WHERE b BETWEEN 1 AND 2 ORDER BY a; id 1 select_type SIMPLE table t1 type range possible_keys bkey key bkey key_len 5 ref NULL rows 16 Extra Using where; Using index; Using filesort SELECT * FROM t1 WHERE b BETWEEN 1 AND 2 ORDER BY a; a b 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 2 12 2 13 2 14 2 15 2 16 2 17 1 18 1 19 1 20 1 21 1 22 1 23 1 24 1 25 1 26 1 27 1 28 1 29 1 30 1 31 1 32 1 EXPLAIN SELECT * FROM t1 WHERE b BETWEEN 1 AND 2 ORDER BY b,a; id 1 select_type SIMPLE table t1 type range possible_keys bkey key bkey key_len 5 ref NULL rows 16 Extra Using where; Using index SELECT * FROM t1 WHERE b BETWEEN 1 AND 2 ORDER BY b,a; a b 17 1 18 1 19 1 20 1 21 1 22 1 23 1 24 1 25 1 26 1 27 1 28 1 29 1 30 1 31 1 32 1 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 2 12 2 13 2 14 2 15 2 16 2 CREATE TABLE t2 (a int, b int, c int, PRIMARY KEY (a), KEY bkey (b,c)) ENGINE=InnoDB; INSERT INTO t2 VALUES (1,1,1),(3,1,1),(2,1,1),(4,1,1); INSERT INTO t2 SELECT a + 4, 1, 1 FROM t2; INSERT INTO t2 SELECT a + 8, 1, 1 FROM t2; EXPLAIN SELECT * FROM t2 WHERE b=1 ORDER BY a; id 1 select_type SIMPLE table t2 type ref possible_keys bkey key bkey key_len 5 ref const rows 8 Extra Using where; Using index; Using filesort SELECT * FROM t2 WHERE b=1 ORDER BY a; a b c 1 1 1 2 1 1 3 1 1 4 1 1 5 1 1 6 1 1 7 1 1 8 1 1 9 1 1 10 1 1 11 1 1 12 1 1 13 1 1 14 1 1 15 1 1 16 1 1 EXPLAIN SELECT * FROM t2 WHERE b=1 AND c=1 ORDER BY a; id 1 select_type SIMPLE table t2 type ref possible_keys bkey key bkey key_len 10 ref const,const rows 8 Extra Using where; Using index SELECT * FROM t2 WHERE b=1 AND c=1 ORDER BY a; a b c 1 1 1 2 1 1 3 1 1 4 1 1 5 1 1 6 1 1 7 1 1 8 1 1 9 1 1 10 1 1 11 1 1 12 1 1 13 1 1 14 1 1 15 1 1 16 1 1 EXPLAIN SELECT * FROM t2 WHERE b=1 AND c=1 ORDER BY b,c,a; id 1 select_type SIMPLE table t2 type ref possible_keys bkey key bkey key_len 10 ref const,const rows 8 Extra Using where; Using index SELECT * FROM t2 WHERE b=1 AND c=1 ORDER BY b,c,a; a b c 1 1 1 2 1 1 3 1 1 4 1 1 5 1 1 6 1 1 7 1 1 8 1 1 9 1 1 10 1 1 11 1 1 12 1 1 13 1 1 14 1 1 15 1 1 16 1 1 EXPLAIN SELECT * FROM t2 WHERE b=1 AND c=1 ORDER BY c,a; id 1 select_type SIMPLE table t2 type ref possible_keys bkey key bkey key_len 10 ref const,const rows 8 Extra Using where; Using index SELECT * FROM t2 WHERE b=1 AND c=1 ORDER BY c,a; a b c 1 1 1 2 1 1 3 1 1 4 1 1 5 1 1 6 1 1 7 1 1 8 1 1 9 1 1 10 1 1 11 1 1 12 1 1 13 1 1 14 1 1 15 1 1 16 1 1 DROP TABLE t1,t2; CREATE TABLE t1 (a INT, PRIMARY KEY (a)) ENGINE=InnoDB; INSERT INTO t1 VALUES (1),(2),(3),(4),(5),(6),(7),(8); INSERT INTO t1 SELECT a + 8 FROM t1; INSERT INTO t1 SELECT a + 16 FROM t1; CREATE PROCEDURE p1 () BEGIN DECLARE i INT DEFAULT 50; DECLARE cnt INT; START TRANSACTION; ALTER TABLE t1 ENGINE=InnoDB; COMMIT; START TRANSACTION; WHILE (i > 0) DO SET i = i - 1; SELECT COUNT(*) INTO cnt FROM t1 LOCK IN SHARE MODE; END WHILE; COMMIT; END;| CALL p1(); CALL p1(); CALL p1(); DROP PROCEDURE p1; DROP TABLE t1; create table t1(a text) engine=innodb default charset=utf8; insert into t1 values('aaa'); alter table t1 add index(a(1024)); Warnings: Warning 1071 Specified key was too long; max key length is 767 bytes Warning 1071 Specified key was too long; max key length is 767 bytes show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` text, KEY `a` (`a`(255)) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 drop table t1; CREATE TABLE t1 ( a INT, b INT, KEY (b) ) ENGINE=InnoDB; INSERT INTO t1 VALUES (1,10), (2,10), (2,20), (3,30); START TRANSACTION; SELECT * FROM t1 WHERE b=20 FOR UPDATE; a b 2 20 START TRANSACTION; SELECT * FROM t1 WHERE b=10 ORDER BY A FOR UPDATE; a b 1 10 2 10 ROLLBACK; ROLLBACK; DROP TABLE t1; CREATE TABLE t1( a INT, b INT NOT NULL, c INT NOT NULL, d INT, UNIQUE KEY (c,b) ) engine=innodb; INSERT INTO t1 VALUES (1,1,1,50), (1,2,3,40), (2,1,3,4); EXPLAIN SELECT c,b,d FROM t1 GROUP BY c,b,d; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using filesort SELECT c,b,d FROM t1 GROUP BY c,b,d; c b d 1 1 50 3 1 4 3 2 40 EXPLAIN SELECT c,b,d FROM t1 GROUP BY c,b,d ORDER BY NULL; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 SELECT c,b,d FROM t1 GROUP BY c,b,d ORDER BY NULL; c b d 1 1 50 3 1 4 3 2 40 EXPLAIN SELECT c,b,d FROM t1 ORDER BY c,b,d; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using filesort SELECT c,b,d FROM t1 ORDER BY c,b,d; c b d 1 1 50 3 1 4 3 2 40 EXPLAIN SELECT c,b,d FROM t1 GROUP BY c,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL c 8 NULL 3 SELECT c,b,d FROM t1 GROUP BY c,b; c b d 1 1 50 3 1 4 3 2 40 EXPLAIN SELECT c,b FROM t1 GROUP BY c,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index NULL c 8 NULL 3 Using index SELECT c,b FROM t1 GROUP BY c,b; c b 1 1 3 1 3 2 DROP TABLE t1; CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a), INDEX b (b)) ENGINE=InnoDB; INSERT INTO t1(a,b) VALUES (1,1), (2,2), (3,2); EXPLAIN SELECT * FROM t1 WHERE b=2 ORDER BY a ASC; id 1 select_type SIMPLE table t1 type ref possible_keys b key b key_len 5 ref const rows 1 Extra Using where; Using index SELECT * FROM t1 WHERE b=2 ORDER BY a ASC; a b 2 2 3 2 EXPLAIN SELECT * FROM t1 WHERE b=2 ORDER BY a DESC; id 1 select_type SIMPLE table t1 type ref possible_keys b key b key_len 5 ref const rows 1 Extra Using where; Using index SELECT * FROM t1 WHERE b=2 ORDER BY a DESC; a b 3 2 2 2 EXPLAIN SELECT * FROM t1 ORDER BY b ASC, a ASC; id 1 select_type SIMPLE table t1 type index possible_keys NULL key b key_len 5 ref NULL rows 3 Extra Using index SELECT * FROM t1 ORDER BY b ASC, a ASC; a b 1 1 2 2 3 2 EXPLAIN SELECT * FROM t1 ORDER BY b DESC, a DESC; id 1 select_type SIMPLE table t1 type index possible_keys NULL key b key_len 5 ref NULL rows 3 Extra Using index SELECT * FROM t1 ORDER BY b DESC, a DESC; a b 3 2 2 2 1 1 EXPLAIN SELECT * FROM t1 ORDER BY b ASC, a DESC; id 1 select_type SIMPLE table t1 type index possible_keys NULL key b key_len 5 ref NULL rows 3 Extra Using index; Using filesort SELECT * FROM t1 ORDER BY b ASC, a DESC; a b 1 1 3 2 2 2 EXPLAIN SELECT * FROM t1 ORDER BY b DESC, a ASC; id 1 select_type SIMPLE table t1 type index possible_keys NULL key b key_len 5 ref NULL rows 3 Extra Using index; Using filesort SELECT * FROM t1 ORDER BY b DESC, a ASC; a b 2 2 3 2 1 1 DROP TABLE t1; # # Bug#27610: ALTER TABLE ROW_FORMAT=... does not rebuild the table. # # - prepare; DROP TABLE IF EXISTS t1; CREATE TABLE t1(c INT) ENGINE = InnoDB ROW_FORMAT = COMPACT; # - initial check; SELECT table_schema, table_name, row_format FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = DATABASE() AND table_name = 't1'; table_schema table_name row_format test t1 Compact # - change ROW_FORMAT and check; ALTER TABLE t1 ROW_FORMAT = REDUNDANT; SELECT table_schema, table_name, row_format FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = DATABASE() AND table_name = 't1'; table_schema table_name row_format test t1 Redundant # - that's it, cleanup. DROP TABLE t1; create table t1(a char(10) not null, unique key aa(a(1)), b char(4) not null, unique key bb(b(4))) engine=innodb; desc t1; Field Type Null Key Default Extra a char(10) NO UNI NULL b char(4) NO PRI NULL show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `a` char(10) NOT NULL, `b` char(4) NOT NULL, UNIQUE KEY `bb` (`b`), UNIQUE KEY `aa` (`a`(1)) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 drop table t1; CREATE TABLE t1 (id int, type char(6), d int, INDEX idx(id,d)) ENGINE=InnoDB; INSERT INTO t1 VALUES (191, 'member', 1), (NULL, 'member', 3), (NULL, 'member', 4), (201, 'member', 2); EXPLAIN SELECT * FROM t1 WHERE id=191 OR id IS NULL ORDER BY d; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL idx NULL NULL NULL 4 Using where; Using filesort SELECT * FROM t1 WHERE id=191 OR id IS NULL ORDER BY d; id type d 191 member 1 NULL member 3 NULL member 4 DROP TABLE t1; set @my_innodb_autoextend_increment=@@global.innodb_autoextend_increment; set global innodb_autoextend_increment=8; set global innodb_autoextend_increment=@my_innodb_autoextend_increment; set @my_innodb_commit_concurrency=@@global.innodb_commit_concurrency; set global innodb_commit_concurrency=0; set global innodb_commit_concurrency=@my_innodb_commit_concurrency; CREATE TABLE t1 (a int, b int, c int, PRIMARY KEY (a), KEY t1_b (b)) ENGINE=InnoDB; INSERT INTO t1 (a,b,c) VALUES (1,1,1), (2,1,1), (3,1,1), (4,1,1); INSERT INTO t1 (a,b,c) SELECT a+4,b,c FROM t1; EXPLAIN SELECT a, b, c FROM t1 WHERE b = 1 ORDER BY a DESC LIMIT 5; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index t1_b PRIMARY 4 NULL 8 Using where SELECT a, b, c FROM t1 WHERE b = 1 ORDER BY a DESC LIMIT 5; a b c 8 1 1 7 1 1 6 1 1 5 1 1 4 1 1 DROP TABLE t1; End of 5.0 tests CREATE TABLE `t2` ( `k` int(11) NOT NULL auto_increment, `a` int(11) default NULL, `c` int(11) default NULL, PRIMARY KEY (`k`), UNIQUE KEY `idx_1` (`a`) ); insert into t2 ( a ) values ( 6 ) on duplicate key update c = ifnull( c, 0 ) + 1; insert into t2 ( a ) values ( 7 ) on duplicate key update c = ifnull( c, 0 ) + 1; select last_insert_id(); last_insert_id() 2 select * from t2; k a c 1 6 NULL 2 7 NULL insert into t2 ( a ) values ( 6 ) on duplicate key update c = ifnull( c, 0 ) + 1; select last_insert_id(); last_insert_id() 2 select last_insert_id(0); last_insert_id(0) 0 insert into t2 ( a ) values ( 6 ) on duplicate key update c = ifnull( c, 0 ) + 1; select last_insert_id(); last_insert_id() 0 select * from t2; k a c 1 6 2 2 7 NULL insert ignore into t2 values (null,6,1),(10,8,1); select last_insert_id(); last_insert_id() 0 insert ignore into t2 values (null,6,1),(null,8,1),(null,15,1),(null,20,1); select last_insert_id(); last_insert_id() 11 select * from t2; k a c 1 6 2 2 7 NULL 10 8 1 11 15 1 12 20 1 insert into t2 ( a ) values ( 6 ) on duplicate key update c = ifnull( c, 0 ) + 1, k=last_insert_id(k); select last_insert_id(); last_insert_id() 1 select * from t2; k a c 1 6 3 2 7 NULL 10 8 1 11 15 1 12 20 1 drop table t2; drop table if exists t1, t2; create table t1 (i int); alter table t1 modify i int default 1; alter table t1 modify i int default 2, rename t2; lock table t2 write; alter table t2 modify i int default 3; unlock tables; lock table t2 write; alter table t2 modify i int default 4, rename t1; unlock tables; drop table t1; drop table if exists t1; create table t1 (i int); insert into t1 values (); lock table t1 write; alter table t1 modify i int default 1; insert into t1 values (); select * from t1; i NULL 1 alter table t1 change i c char(10) default "Two"; insert into t1 values (); select * from t1; c NULL 1 Two unlock tables; select * from t1; c NULL 1 Two drop tables t1; create table t1(f1 varchar(5) unique, f2 timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP); insert into t1(f1) values(1); select @a:=f2 from t1; @a:=f2 # update t1 set f1=1; select @b:=f2 from t1; @b:=f2 # select if(@a=@b,"ok","wrong"); if(@a=@b,"ok","wrong") ok insert into t1(f1) values (1) on duplicate key update f1="1"; select @b:=f2 from t1; @b:=f2 # select if(@a=@b,"ok","wrong"); if(@a=@b,"ok","wrong") ok insert into t1(f1) select f1 from t1 on duplicate key update f1="1"; select @b:=f2 from t1; @b:=f2 # select if(@a=@b,"ok","wrong"); if(@a=@b,"ok","wrong") ok drop table t1; SET SESSION AUTOCOMMIT = 0; SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED; set binlog_format=mixed; # Switch to connection con1 CREATE TABLE t1 (a INT PRIMARY KEY, b VARCHAR(256)) ENGINE = InnoDB; INSERT INTO t1 VALUES (1,2); # 1. test for locking: BEGIN; UPDATE t1 SET b = 12 WHERE a = 1; affected rows: 1 info: Rows matched: 1 Changed: 1 Warnings: 0 SELECT * FROM t1; a b 1 12 # Switch to connection con2 UPDATE t1 SET b = 21 WHERE a = 1; ERROR HY000: Lock wait timeout exceeded; try restarting transaction # Switch to connection con1 SELECT * FROM t1; a b 1 12 ROLLBACK; # 2. test for serialized update: CREATE TABLE t2 (a INT); TRUNCATE t1; INSERT INTO t1 VALUES (1,'init'); CREATE PROCEDURE p1() BEGIN UPDATE t1 SET b = CONCAT(b, '+con2') WHERE a = 1; INSERT INTO t2 VALUES (); END| BEGIN; UPDATE t1 SET b = CONCAT(b, '+con1') WHERE a = 1; affected rows: 1 info: Rows matched: 1 Changed: 1 Warnings: 0 SELECT * FROM t1; a b 1 init+con1 # Switch to connection con2 CALL p1;; # Switch to connection con1 SELECT * FROM t1; a b 1 init+con1 COMMIT; SELECT * FROM t1; a b 1 init+con1 # Switch to connection con2 SELECT * FROM t1; a b 1 init+con1+con2 # Switch to connection con1 # 3. test for updated key column: TRUNCATE t1; TRUNCATE t2; INSERT INTO t1 VALUES (1,'init'); BEGIN; UPDATE t1 SET a = 2, b = CONCAT(b, '+con1') WHERE a = 1; affected rows: 1 info: Rows matched: 1 Changed: 1 Warnings: 0 SELECT * FROM t1; a b 2 init+con1 # Switch to connection con2 CALL p1;; # Switch to connection con1 SELECT * FROM t1; a b 2 init+con1 COMMIT; SELECT * FROM t1; a b 2 init+con1 # Switch to connection con2 SELECT * FROM t1; a b 2 init+con1 DROP PROCEDURE p1; DROP TABLE t1, t2; CREATE TABLE t1 (a INT NOT NULL, b INT NOT NULL, PRIMARY KEY (a,b)) engine=innodb; CREATE TABLE t2 (c INT NOT NULL, d INT NOT NULL, PRIMARY KEY (c,d), CONSTRAINT c2 FOREIGN KEY f2 (c) REFERENCES t1 (a,b) ON UPDATE NO ACTION) engine=innodb; ERROR 42000: Incorrect foreign key definition for 'f2': Key reference and table reference don't match CREATE TABLE t2 (c INT NOT NULL, d INT NOT NULL, PRIMARY KEY (c,d), CONSTRAINT c2 FOREIGN KEY (c) REFERENCES t1 (a,b) ON UPDATE NO ACTION) engine=innodb; ERROR 42000: Incorrect foreign key definition for 'c2': Key reference and table reference don't match CREATE TABLE t2 (c INT NOT NULL, d INT NOT NULL, PRIMARY KEY (c,d), CONSTRAINT c1 FOREIGN KEY c2 (c) REFERENCES t1 (a) ON DELETE NO ACTION, CONSTRAINT c2 FOREIGN KEY (c) REFERENCES t1 (a) ON UPDATE NO ACTION) engine=innodb; ALTER TABLE t2 DROP FOREIGN KEY c2; DROP TABLE t2; CREATE TABLE t2 (c INT NOT NULL, d INT NOT NULL, PRIMARY KEY (c,d), FOREIGN KEY (c) REFERENCES t1 (a,k) ON UPDATE NO ACTION) engine=innodb; ERROR 42000: Incorrect foreign key definition for 'foreign key without name': Key reference and table reference don't match CREATE TABLE t2 (c INT NOT NULL, d INT NOT NULL, PRIMARY KEY (c,d), FOREIGN KEY f1 (c) REFERENCES t1 (a,k) ON UPDATE NO ACTION) engine=innodb; ERROR 42000: Incorrect foreign key definition for 'f1': Key reference and table reference don't match CREATE TABLE t2 (c INT NOT NULL, d INT NOT NULL, PRIMARY KEY (c,d), CONSTRAINT c1 FOREIGN KEY f1 (c) REFERENCES t1 (a) ON DELETE NO ACTION, CONSTRAINT c2 FOREIGN KEY (c) REFERENCES t1 (a) ON UPDATE NO ACTION, FOREIGN KEY f3 (c) REFERENCES t1 (a) ON UPDATE NO ACTION, FOREIGN KEY (c) REFERENCES t1 (a) ON UPDATE NO ACTION) engine=innodb; SHOW CREATE TABLE t2; Table Create Table t2 CREATE TABLE `t2` ( `c` int(11) NOT NULL, `d` int(11) NOT NULL, PRIMARY KEY (`c`,`d`), CONSTRAINT `c1` FOREIGN KEY (`c`) REFERENCES `t1` (`a`) ON DELETE NO ACTION, CONSTRAINT `c2` FOREIGN KEY (`c`) REFERENCES `t1` (`a`) ON UPDATE NO ACTION, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`c`) REFERENCES `t1` (`a`) ON UPDATE NO ACTION, CONSTRAINT `t2_ibfk_2` FOREIGN KEY (`c`) REFERENCES `t1` (`a`) ON UPDATE NO ACTION ) ENGINE=InnoDB DEFAULT CHARSET=latin1 DROP TABLE t2; DROP TABLE t1; create table t1 (a int auto_increment primary key) engine=innodb; alter table t1 order by a; Warnings: Warning 1105 ORDER BY ignored as there is a user-defined clustered index in the table 't1' drop table t1; CREATE TABLE t1 (vid integer NOT NULL, tid integer NOT NULL, idx integer NOT NULL, name varchar(128) NOT NULL, type varchar(128) NULL, PRIMARY KEY(idx, vid, tid), UNIQUE(vid, tid, name) ) ENGINE=InnoDB; INSERT INTO t1 VALUES (1,1,1,'pk',NULL),(2,1,1,'pk',NULL),(3,1,1,'pk',NULL),(4,1,1,'c1',NULL), (5,1,1,'pk',NULL),(1,1,2,'c1',NULL),(2,1,2,'c1',NULL),(3,1,2,'c1',NULL), (4,1,2,'c2',NULL),(5,1,2,'c1',NULL),(2,1,3,'c2',NULL),(3,1,3,'c2',NULL), (4,1,3,'pk',NULL),(5,1,3,'c2',NULL), (2,1,4,'c_extra',NULL),(3,1,4,'c_extra',NULL); EXPLAIN SELECT * FROM t1 WHERE tid = 1 AND vid = 3 ORDER BY idx DESC; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 index vid PRIMARY 12 NULL 16 Using where SELECT * FROM t1 WHERE tid = 1 AND vid = 3 ORDER BY idx DESC; vid tid idx name type 3 1 4 c_extra NULL 3 1 3 c2 NULL 3 1 2 c1 NULL 3 1 1 pk NULL DROP TABLE t1; End of 5.1 tests drop table if exists 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, b int, pk int, key(a,b), primary key(pk)) engine=innodb; insert into t2 select @a:=A.a+10*(B.a + 10*C.a),@a, @a from t1 A, t1 B, t1 C; this must use key 'a', not PRIMARY: explain select a from t2 where a=b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t2 index NULL a 10 NULL # Using where; Using index drop table t1, t2; SET SESSION BINLOG_FORMAT=STATEMENT; SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED; SHOW VARIABLES LIKE 'log_bin'; Variable_name Value log_bin OFF SELECT @@session.binlog_format; @@session.binlog_format STATEMENT SELECT @@session.tx_isolation; @@session.tx_isolation READ-COMMITTED CREATE TABLE t1 ( a INT ) ENGINE=InnoDB; INSERT INTO t1 VALUES(1);