# # Test of unions # drop table if exists t1,t2,t3; CREATE TABLE t1 (a int not null, b char (10) not null); insert into t1 values(1,'a'),(2,'b'),(3,'c'),(3,'c'); CREATE TABLE t2 (a int not null, b char (10) not null); insert into t2 values (3,'c'),(4,'d'),(5,'f'),(6,'e'); select a,b from t1 union select a,b from t2; select a,b from t1 union all select a,b from t2; select a,b from t1 union all select a,b from t2 order by b; select a,b from t1 union all select a,b from t2 union select 7,'g'; select 0,'#' union select a,b from t1 union all select a,b from t2 union select 7,'gg'; select a,b from t1 union select a,b from t1; select 't1',b,count(*) from t1 group by b UNION select 't2',b,count(*) from t2 group by b; #test alternate syntax for unions (select a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 4; (select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1); (select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc; # Test some error conditions with UNION explain select a,b from t1 union all select a,b from t2; --error 1054 explain select xx from t1 union select 1; explain select a,b from t1 union select 1; explain select 1 union select a,b from t1 union select 1; explain select a,b from t1 union select 1 limit 0; --error 1221 select a,b from t1 into outfile 'skr' union select a,b from t2; --error 1221 select a,b from t1 order by a union select a,b from t2; --error 1221 insert into t3 select a from t1 order by a union select a from t2; --error 1222 create table t3 select a,b from t1 union select a from t2; --error 1222 select a,b from t1 union select a from t2; --error 1222 select * from t1 union select a from t2; --error 1222 select a from t1 union select * from t2; # Test CREATE, INSERT and REPLACE create table t3 select a,b from t1 union all select a,b from t2; insert into t3 select a,b from t1 union all select a,b from t2; replace into t3 select a,b as c from t1 union all select a,b from t2; drop table t1,t2,t3; # # Test bug reported by joc@presence-pc.com # CREATE TABLE t1 ( `pseudo` char(35) NOT NULL default '', `pseudo1` char(35) NOT NULL default '', `same` tinyint(1) unsigned NOT NULL default '1', PRIMARY KEY (`pseudo1`), KEY `pseudo` (`pseudo`) ) TYPE=MyISAM; INSERT INTO t1 (pseudo,pseudo1,same) VALUES ('joce', 'testtt', 1),('joce', 'tsestset', 1),('dekad', 'joce', 1); SELECT pseudo FROM t1 WHERE pseudo1='joce' UNION SELECT pseudo FROM t1 WHERE pseudo='joce'; SELECT pseudo1 FROM t1 WHERE pseudo1='joce' UNION SELECT pseudo1 FROM t1 WHERE pseudo='joce'; SELECT * FROM t1 WHERE pseudo1='joce' UNION SELECT * FROM t1 WHERE pseudo='joce' order by pseudo desc,pseudo1 desc; SELECT pseudo1 FROM t1 WHERE pseudo='joce' UNION SELECT pseudo FROM t1 WHERE pseudo1='joce'; SELECT pseudo1 FROM t1 WHERE pseudo='joce' UNION ALL SELECT pseudo FROM t1 WHERE pseudo1='joce'; SELECT pseudo1 FROM t1 WHERE pseudo='joce' UNION SELECT 1; drop table t1;