select (select 2); SELECT (SELECT 1) UNION SELECT (SELECT 2); SELECT (SELECT (SELECT 0 UNION SELECT 0)); -- error 1245 SELECT (SELECT 1 FROM (SELECT 1) as b HAVING a=1) as a; -- error 1245 SELECT (SELECT 1 FROM (SELECT 1) as b HAVING b=1) as a,(SELECT 1 FROM (SELECT 1) as c HAVING a=1) as b; SELECT (SELECT 1),MAX(1) FROM (SELECT 1) as a; -- error 1245 SELECT (SELECT a) as a; EXPLAIN SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1; SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1; -- error 1054 SELECT (SELECT 1), a; SELECT 1 as a FROM (SELECT 1) as b HAVING (SELECT a)=1; -- error 1054 SELECT 1 FROM (SELECT (SELECT a) b) c; drop table if exists t1,t2,t3,t4,t5,t6,t7,t8; create table t1 (a int); create table t2 (a int, b int); create table t3 (a int); create table t4 (a int, b int); insert into t1 values (2); insert into t2 values (1,7),(2,7); insert into t4 values (4,8),(3,8),(5,9); -- error 1245 select (select a from t1 where t1.a = a1) as a2, (select b from t2 where t2.b=a2) as a1; select (select a from t1 where t1.a=t2.a), a from t2; select (select a from t1 where t1.a=t2.b), a from t2; select (select a from t1), a from t2; select (select a from t3), a from t2; select * from t2 where t2.a=(select a from t1); insert into t3 values (6),(7),(3); select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1); select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1) union (select * from t4 order by a limit 2) limit 3; select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1) union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a); explain select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1) union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a); select (select a from t3 where a<t2.a*4 order by 1 desc limit 1), a from t2; select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from (select * from t2 where a>1) as tt; explain select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from (select * from t2 where a>1) as tt; select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3) order by 1 desc limit 1); select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3 where t3.a > t1.a) order by 1 desc limit 1); select * from t1 where t1.a=(select t2.a from t2 where t2.b=(select max(a) from t3 where t3.a < t1.a) order by 1 desc limit 1); select b,(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) from t4; explain select b,(select avg(t2.a+(select min(t3.a) from t3 where t3.a >= t4.a)) from t2) from t4; select * from t3 where exists (select * from t2 where t2.b=t3.a); select * from t3 where not exists (select * from t2 where t2.b=t3.a); select * from t3 where a in (select b from t2); select * from t3 where a not in (select b from t2); select * from t3 where a = some (select b from t2); select * from t3 where a <> any (select b from t2); select * from t3 where a = all (select b from t2); select * from t3 where a <> all (select b from t2); insert into t2 values (100, 5); select * from t3 where a < any (select b from t2); select * from t3 where a < all (select b from t2); select * from t3 where a >= any (select b from t2); select * from t3 where a >= all (select b from t2); delete from t2 where a=100; -- error 1239 select * from t3 where a in (select a,b from t2); -- error 1239 select * from t3 where a in (select * from t2); insert into t4 values (12,7),(1,7),(10,9),(9,6),(7,6),(3,9); select b,max(a) as ma from t4 group by b having b < (select max(t2.a) from t2 where t2.b=t4.b); select b,max(a) as ma from t4 group by b having b >= (select max(t2.a) from t2 where t2.b=t4.b); create table t5 (a int); select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2; insert into t5 values (5); select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2; insert into t5 values (2); select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2; explain select (select a from t1 where t1.a=t2.a union select a from t5 where t5.a=t2.a), a from t2; -- error 1240 select (select a from t1 where t1.a=t2.a union all select a from t5 where t5.a=t2.a), a from t2; create table t6 (patient_uq int, clinic_uq int, index i1 (clinic_uq)); create table t7( uq int primary key, name char(25)); insert into t7 values(1,"Oblastnaia bolnitsa"),(2,"Bolnitsa Krasnogo Kresta"); insert into t6 values (1,1),(1,2),(2,2),(1,3); select * from t6 where exists (select * from t7 where uq = clinic_uq); # not unique fields -- error 1052 select * from t1 where a= (select a from t2,t4 where t2.b=t4.b); # different tipes & group functions drop table if exists t1,t2,t3; CREATE TABLE t3 (a varchar(20),b char(1) NOT NULL default '0'); INSERT INTO t3 VALUES ('W','a'),('A','c'),('J','b'); CREATE TABLE t2 (a varchar(20),b int NOT NULL default '0'); INSERT INTO t2 VALUES ('W','1'),('A','3'),('J','2'); CREATE TABLE t1 (a varchar(20),b date NOT NULL default '0000-00-00'); INSERT INTO t1 VALUES ('W','1732-02-22'),('A','1735-10-30'),('J','1743-04-13'); SELECT * FROM t1 WHERE b = (SELECT MIN(b) FROM t1); SELECT * FROM t2 WHERE b = (SELECT MIN(b) FROM t2); SELECT * FROM t3 WHERE b = (SELECT MIN(b) FROM t3); drop table if exists t8; CREATE TABLE `t8` ( `pseudo` varchar(35) character set latin1 NOT NULL default '', `email` varchar(60) character set latin1 NOT NULL default '', PRIMARY KEY (`pseudo`), UNIQUE KEY `email` (`email`) ) TYPE=MyISAM CHARSET=latin1 ROW_FORMAT=DYNAMIC; INSERT INTO t8 (pseudo,email) VALUES ('joce','test'); INSERT INTO t8 (pseudo,email) VALUES ('joce1','test1'); INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1'); EXPLAIN SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'); -- error 1239 SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM t8 WHERE pseudo='joce'); -- error 1239 SELECT pseudo FROM t8 WHERE pseudo=(SELECT * FROM t8 WHERE pseudo='joce'); SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'); -- error 1240 SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo LIKE '%joce%'); drop table if exists t1,t2,t3,t4,t5,t6,t7,t8; #searchconthardwarefr3 forumconthardwarefr7 CREATE TABLE `t1` ( `topic` mediumint(8) unsigned NOT NULL default '0', `date` date NOT NULL default '0000-00-00', `pseudo` varchar(35) character set latin1 NOT NULL default '', PRIMARY KEY (`pseudo`,`date`,`topic`), KEY `topic` (`topic`) ) TYPE=MyISAM ROW_FORMAT=DYNAMIC; INSERT INTO t1 (topic,date,pseudo) VALUES ('43506','2002-10-02','joce'),('40143','2002-08-03','joce'); EXPLAIN SELECT DISTINCT date FROM t1 WHERE date='2002-08-03'; EXPLAIN SELECT (SELECT DISTINCT date FROM t1 WHERE date='2002-08-03'); SELECT DISTINCT date FROM t1 WHERE date='2002-08-03'; SELECT (SELECT DISTINCT date FROM t1 WHERE date='2002-08-03'); SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION SELECT 1) UNION ALL SELECT 1; -- error 1240 SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION ALL SELECT 1) UNION SELECT 1; EXPLAIN SELECT 1 FROM t1 WHERE 1=(SELECT 1 UNION SELECT 1); drop table t1; #forumconthardwarefr7 searchconthardwarefr7 CREATE TABLE `t1` ( `numeropost` mediumint(8) unsigned NOT NULL auto_increment, `maxnumrep` int(10) unsigned NOT NULL default '0', PRIMARY KEY (`numeropost`), UNIQUE KEY `maxnumrep` (`maxnumrep`) ) TYPE=MyISAM ROW_FORMAT=FIXED; INSERT INTO t1 (numeropost,maxnumrep) VALUES (40143,1),(43506,2); CREATE TABLE `t2` ( `mot` varchar(30) NOT NULL default '', `topic` mediumint(8) unsigned NOT NULL default '0', `date` date NOT NULL default '0000-00-00', `pseudo` varchar(35) NOT NULL default '', PRIMARY KEY (`mot`,`pseudo`,`date`,`topic`) ) TYPE=MyISAM ROW_FORMAT=DYNAMIC; INSERT INTO t2 (mot,topic,date,pseudo) VALUES ('joce','40143','2002-10-22','joce'), ('joce','43506','2002-10-22','joce'); select numeropost as a FROM t1 GROUP BY (SELECT 1 FROM t1 HAVING a=1); SELECT numeropost,maxnumrep FROM t1 WHERE exists (SELECT 1 FROM t2 WHERE (mot='joce') AND date >= '2002-10-21' AND t1.numeropost = t2.topic) ORDER BY maxnumrep DESC LIMIT 0, 20; -- error 1054 SELECT (SELECT 1) as a FROM (SELECT 1 FROM t1 HAVING a=1) b; -- error 1054 SELECT 1 IN (SELECT 1 FROM t2 HAVING a); SELECT * from t2 where topic IN (SELECT topic FROM t2 GROUP BY date); SELECT * from t2 where topic IN (SELECT topic FROM t2 GROUP BY date HAVING topic < 4100); SELECT * from t2 where topic IN (SELECT SUM(topic) FROM t1); SELECT * from t2 where topic = any (SELECT topic FROM t2 GROUP BY date); SELECT * from t2 where topic = any (SELECT topic FROM t2 GROUP BY date HAVING topic < 4100); SELECT * from t2 where topic = any (SELECT SUM(topic) FROM t1); SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY date); SELECT * from t2 where topic = all (SELECT topic FROM t2 GROUP BY date HAVING topic < 4100); SELECT * from t2 where topic = all (SELECT SUM(topic) FROM t2); SELECT * from t2 where topic <> any (SELECT SUM(topic) FROM t2); drop table t1,t2; #forumconthardwarefr7 CREATE TABLE `t1` ( `numeropost` mediumint(8) unsigned NOT NULL auto_increment, `maxnumrep` int(10) unsigned NOT NULL default '0', PRIMARY KEY (`numeropost`), UNIQUE KEY `maxnumrep` (`maxnumrep`) ) TYPE=MyISAM ROW_FORMAT=FIXED; INSERT INTO t1 (numeropost,maxnumrep) VALUES (1,0),(2,1); -- error 1240 select numeropost as a FROM t1 GROUP BY (SELECT 1 FROM t1 HAVING a=1); -- error 1240 select numeropost as a FROM t1 ORDER BY (SELECT 1 FROM t1 HAVING a=1); drop table t1; #iftest CREATE TABLE t1 (field char(1) NOT NULL DEFAULT 'b'); INSERT INTO t1 VALUES (); -- error 1240 SELECT field FROM t1 WHERE 1=(SELECT 1 UNION ALL SELECT 1 FROM (SELECT 1) a HAVING field='b'); drop table t1; # threadhardwarefr7 CREATE TABLE `t1` ( `numeropost` mediumint(8) unsigned NOT NULL default '0', `numreponse` int(10) unsigned NOT NULL auto_increment, `pseudo` varchar(35) NOT NULL default '', PRIMARY KEY (`numeropost`,`numreponse`), UNIQUE KEY `numreponse` (`numreponse`), KEY `pseudo` (`pseudo`,`numeropost`) ) TYPE=MyISAM; -- error 1245 SELECT (SELECT numeropost FROM t1 HAVING numreponse=a),numreponse FROM (SELECT * FROM t1) as a; -- error 1054 SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=a) FROM (SELECT * FROM t1) as a; SELECT numreponse, (SELECT numeropost FROM t1 HAVING numreponse=1) FROM (SELECT * FROM t1) as a; INSERT INTO t1 (numeropost,numreponse,pseudo) VALUES (1,1,'joce'),(1,2,'joce'),(1,3,'test'); -- error 1240 EXPLAIN SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT 1 FROM t1 WHERE numeropost='1'); EXPLAIN SELECT MAX(numreponse) FROM t1 WHERE numeropost='1'; EXPLAIN SELECT numreponse FROM t1 WHERE numeropost='1' AND numreponse=(SELECT MAX(numreponse) FROM t1 WHERE numeropost='1'); drop table t1; CREATE TABLE t1 (a int(1)); INSERT INTO t1 VALUES (1); SELECT 1 FROM (SELECT a FROM t1) b HAVING (SELECT b.a)=1; drop table t1; #update with subselects create table t1 (a int NOT NULL, b int, primary key (a)); create table t2 (a int NOT NULL, b int, primary key (a)); insert into t1 values (0, 10),(1, 11),(2, 12); insert into t2 values (1, 21),(2, 22),(3, 23); select * from t1; update t1 set b= (select b from t2 where t1.a = t2.a); select * from t1; drop table t1, t2; #delete with subselects create table t1 (a int NOT NULL, b int, primary key (a)); create table t2 (a int NOT NULL, b int, primary key (a)); insert into t1 values (0, 10),(1, 11),(2, 12); insert into t2 values (1, 21),(2, 12),(3, 23); select * from t1; select * from t1 where b = (select b from t2 where t1.a = t2.a); delete from t1 where b = (select b from t2 where t1.a = t2.a); select * from t1; drop table t1, t2; #multi-delete with subselects drop table if exists t11, t12, t2; create table t11 (a int NOT NULL, b int, primary key (a)); create table t12 (a int NOT NULL, b int, primary key (a)); create table t2 (a int NOT NULL, b int, primary key (a)); insert into t11 values (0, 10),(1, 11),(2, 12); insert into t12 values (33, 10),(22, 11),(2, 12); insert into t2 values (1, 21),(2, 12),(3, 23); select * from t11; select * from t12; delete t11.*, t12.* from t11,t12 where t11.a = t12.a and t11.b = (select b from t2 where t11.a = t2.a); select * from t11; select * from t12; drop table t11, t12, t2; #insert with subselects CREATE TABLE t1 (x int); create table t2 (a int); insert into t2 values (1); INSERT INTO t1 (x) VALUES ((SELECT a FROM t2)); select * from t1; insert into t2 values (1); INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(a) FROM t2)); -- sleep 1 select * from t1; INSERT INTO t1 (x) select (SELECT SUM(a)+1 FROM t2) FROM t2; select * from t1; -- error 1093 INSERT INTO t1 (x) select (SELECT SUM(x)+2 FROM t1) FROM t2; INSERT DELAYED INTO t1 (x) VALUES ((SELECT SUM(x) FROM t1)); -- sleep 1 select * from t1; drop table t1, t2; #replace with subselects CREATE TABLE t1 (x int not null, y int, primary key (x)); create table t2 (a int); insert into t2 values (1); select * from t1; replace into t1 (x, y) VALUES ((SELECT a FROM t2), (SELECT a+1 FROM t2)); select * from t1; replace into t1 (x, y) VALUES ((SELECT a FROM t2), (SELECT a+2 FROM t2)); select * from t1; replace DELAYED into t1 (x, y) VALUES ((SELECT a+3 FROM t2), (SELECT a FROM t2)); -- sleep 1 select * from t1; replace DELAYED into t1 (x, y) VALUES ((SELECT a+3 FROM t2), (SELECT a+1 FROM t2)); -- sleep 1 select * from t1; replace LOW_PRIORITY into t1 (x, y) VALUES ((SELECT a+1 FROM t2), (SELECT a FROM t2)); select * from t1; drop table t1, t2;