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204 lines
5 KiB
Text
204 lines
5 KiB
Text
drop table if exists t1,t2,t3;
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CREATE TABLE t1 (a int not null, b char (10) not null);
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insert into t1 values(1,'a'),(2,'b'),(3,'c'),(3,'c');
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CREATE TABLE t2 (a int not null, b char (10) not null);
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insert into t2 values (3,'c'),(4,'d'),(5,'f'),(6,'e');
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select a,b from t1 union select a,b from t2;
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a b
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1 a
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2 b
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3 c
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4 d
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5 f
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6 e
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select a,b from t1 union all select a,b from t2;
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a b
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1 a
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2 b
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3 c
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3 c
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3 c
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4 d
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5 f
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6 e
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select a,b from t1 union all select a,b from t2 order by b;
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a b
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1 a
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2 b
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3 c
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3 c
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3 c
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4 d
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6 e
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5 f
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select a,b from t1 union all select a,b from t2 union select 7,'g';
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a b
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1 a
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2 b
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3 c
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3 c
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3 c
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4 d
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5 f
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6 e
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7 g
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select 0,'#' union select a,b from t1 union all select a,b from t2 union select 7,'gg';
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0 #
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0 #
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1 a
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2 b
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3 c
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3 c
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3 c
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4 d
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5 f
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6 e
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7 g
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select a,b from t1 union select a,b from t1;
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a b
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1 a
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2 b
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3 c
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select 't1',b,count(*) from t1 group by b UNION select 't2',b,count(*) from t2 group by b;
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t1 b count(*)
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t1 a 1
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t1 b 1
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t1 c 2
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t2 c 1
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t2 d 1
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t2 e 1
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t2 f 1
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(select a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 4;
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a b
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1 a
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2 b
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3 c
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4 d
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(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1);
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a b
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1 a
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2 b
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3 c
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(select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
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a b
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3 c
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2 b
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1 a
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explain (select a,b from t1 limit 2) union all (select a,b from t2 order by a limit 1) order by b desc;
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table type possible_keys key key_len ref rows Extra
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t1 ALL NULL NULL NULL NULL 4
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t2 ALL NULL NULL NULL NULL 4 Using filesort
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t1 ALL NULL NULL NULL NULL 4
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(select sql_calc_found_rows a,b from t1 limit 2) union all (select a,b from t2 order by a) limit 2;
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a b
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1 a
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2 b
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select found_rows();
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found_rows()
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6
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explain select a,b from t1 union all select a,b from t2;
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table type possible_keys key key_len ref rows Extra
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t1 ALL NULL NULL NULL NULL 4
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t2 ALL NULL NULL NULL NULL 4
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explain select xx from t1 union select 1;
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Unknown column 'xx' in 'field list'
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explain select a,b from t1 union select 1;
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table type possible_keys key key_len ref rows Extra
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t1 ALL NULL NULL NULL NULL 4
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0 0 No tables used
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explain select 1 union select a,b from t1 union select 1;
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table type possible_keys key key_len ref rows Extra
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0 0 No tables used
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t1 ALL NULL NULL NULL NULL 4
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0 0 No tables used
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explain select a,b from t1 union select 1 limit 0;
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table type possible_keys key key_len ref rows Extra
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t1 ALL NULL NULL NULL NULL 4
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0 0 Impossible WHERE
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select a,b from t1 into outfile 'skr' union select a,b from t2;
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Wrong usage of UNION and INTO
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select a,b from t1 order by a union select a,b from t2;
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Wrong usage of UNION and ORDER BY
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insert into t3 select a from t1 order by a union select a from t2;
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Wrong usage of UNION and ORDER BY
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create table t3 select a,b from t1 union select a from t2;
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The used SELECT statements have a different number of columns
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select a,b from t1 union select a from t2;
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The used SELECT statements have a different number of columns
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select * from t1 union select a from t2;
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The used SELECT statements have a different number of columns
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select a from t1 union select * from t2;
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The used SELECT statements have a different number of columns
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select * from t1 union select SQL_BUFFER_RESULT * from t2;
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Wrong usage/placement of 'SQL_BUFFER_RESULT'
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create table t3 select a,b from t1 union all select a,b from t2;
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insert into t3 select a,b from t1 union all select a,b from t2;
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replace into t3 select a,b as c from t1 union all select a,b from t2;
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drop table t1,t2,t3;
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CREATE TABLE t1 (
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`pseudo` char(35) NOT NULL default '',
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`pseudo1` char(35) NOT NULL default '',
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`same` tinyint(1) unsigned NOT NULL default '1',
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PRIMARY KEY (`pseudo1`),
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KEY `pseudo` (`pseudo`)
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) TYPE=MyISAM;
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INSERT INTO t1 (pseudo,pseudo1,same) VALUES ('joce', 'testtt', 1),('joce', 'tsestset', 1),('dekad', 'joce', 1);
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SELECT pseudo FROM t1 WHERE pseudo1='joce' UNION SELECT pseudo FROM t1 WHERE pseudo='joce';
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pseudo
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dekad
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joce
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SELECT pseudo1 FROM t1 WHERE pseudo1='joce' UNION SELECT pseudo1 FROM t1 WHERE pseudo='joce';
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pseudo1
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joce
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testtt
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tsestset
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SELECT * FROM t1 WHERE pseudo1='joce' UNION SELECT * FROM t1 WHERE pseudo='joce' order by pseudo desc,pseudo1 desc;
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pseudo pseudo1 same
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joce tsestset 1
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joce testtt 1
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dekad joce 1
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SELECT pseudo1 FROM t1 WHERE pseudo='joce' UNION SELECT pseudo FROM t1 WHERE pseudo1='joce';
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pseudo1
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testtt
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tsestset
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dekad
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SELECT pseudo1 FROM t1 WHERE pseudo='joce' UNION ALL SELECT pseudo FROM t1 WHERE pseudo1='joce';
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pseudo1
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testtt
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tsestset
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dekad
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SELECT pseudo1 FROM t1 WHERE pseudo='joce' UNION SELECT 1;
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pseudo1
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testtt
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tsestset
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1
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drop table t1;
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drop table if exists t1,t2;
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create table t1 (a int);
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create table t2 (a int);
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insert into t1 values (1),(2),(3),(4),(5);
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insert into t2 values (11),(12),(13),(14),(15);
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(select * from t1 limit 2) union (select * from t2 limit 3) limit 4;
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a
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1
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2
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11
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12
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(select * from t1 limit 2) union (select * from t2 limit 3);
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a
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1
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2
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11
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12
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13
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(select * from t1 limit 2) union (select * from t2 limit 20,3);
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a
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1
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2
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set SQL_SELECT_LIMIT=2;
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(select * from t1 limit 1) union (select * from t2 limit 3);
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a
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1
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11
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set SQL_SELECT_LIMIT=DEFAULT;
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drop table t1,t2;
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