283 lines
6.0 KiB
Plaintext
283 lines
6.0 KiB
Plaintext
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drop table if exists t1,t2;
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create table t1 (a int not null auto_increment, b int not null, primary key(a));
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insert into t1 (b) values (2),(3),(5),(5),(5),(6),(7),(9);
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select SQL_CALC_FOUND_ROWS * from t1;
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a b
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1 2
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2 3
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3 5
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4 5
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5 5
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6 6
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7 7
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8 9
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select found_rows();
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found_rows()
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8
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select SQL_CALC_FOUND_ROWS * from t1 limit 1;
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a b
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1 2
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select found_rows();
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found_rows()
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8
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select SQL_BUFFER_RESULT SQL_CALC_FOUND_ROWS * from t1 limit 1;
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a b
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1 2
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select found_rows();
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found_rows()
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8
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select SQL_CALC_FOUND_ROWS * from t1 order by b desc limit 1;
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a b
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8 9
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select found_rows();
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found_rows()
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8
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select SQL_CALC_FOUND_ROWS distinct b from t1 limit 1;
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b
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2
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select found_rows();
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found_rows()
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6
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select SQL_CALC_FOUND_ROWS b,count(*) as c from t1 group by b order by c desc limit 1;
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b c
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5 3
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select found_rows();
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found_rows()
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6
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select SQL_CALC_FOUND_ROWS * from t1 left join t1 as t2 on (t1.b=t2.a) limit 2,1;
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a b a b
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3 5 5 5
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select found_rows();
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found_rows()
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8
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drop table t1;
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create table t1 (a int not null primary key);
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insert into t1 values (1),(2),(3),(4),(5);
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select sql_calc_found_rows a from t1 where a in (1,2,3) order by a desc limit 0,2;
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a
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3
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2
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select FOUND_ROWS();
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FOUND_ROWS()
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3
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select sql_calc_found_rows a from t1 where a in (1,2,3) order by a+2 desc limit 0,2;
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a
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3
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2
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select FOUND_ROWS();
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FOUND_ROWS()
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3
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drop table t1;
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CREATE TABLE t1 (
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`id` smallint(5) unsigned NOT NULL auto_increment,
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`kid` smallint(5) unsigned NOT NULL default '0',
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PRIMARY KEY (`id`),
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KEY `kid` (`kid`)
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);
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CREATE TABLE t2 (
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id smallint(5) unsigned NOT NULL auto_increment,
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name varchar(50) NOT NULL default '',
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email varchar(50) NOT NULL default '',
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PRIMARY KEY (id),
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UNIQUE KEY e_n (email,name)
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);
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EXPLAIN SELECT SQL_CALC_FOUND_ROWS DISTINCT email FROM t2 LEFT JOIN t1 ON kid = t2.id WHERE t1.id IS NULL LIMIT 10;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 system PRIMARY,kid NULL NULL NULL 0 const row not found
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1 SIMPLE t2 index NULL e_n 104 NULL 10
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SELECT SQL_CALC_FOUND_ROWS DISTINCT email FROM t2 LEFT JOIN t1 ON kid = t2.id WHERE t1.id IS NULL LIMIT 10;
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email
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email1
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email10
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email100
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email101
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email102
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email103
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email104
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email105
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email106
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email107
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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200
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SELECT SQL_CALC_FOUND_ROWS DISTINCT email FROM t2 LEFT JOIN t1 ON kid = t2.id WHERE t1.id IS NULL order by email LIMIT 10;
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email
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email1
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email10
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email100
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email101
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email102
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email103
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email104
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email105
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email106
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email107
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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200
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SELECT DISTINCT email FROM t2 LEFT JOIN t1 ON kid = t2.id WHERE t1.id IS NULL LIMIT 10;
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email
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email1
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email2
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email3
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email4
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email5
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email6
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email7
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email8
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email9
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email10
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SELECT DISTINCT email FROM t2 LEFT JOIN t1 ON kid = t2.id WHERE t1.id IS NULL ORDER BY email LIMIT 10;
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email
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email1
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email10
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email100
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email101
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email102
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email103
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email104
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email105
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email106
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email107
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INSERT INTO `t1` (`id`, `kid`) VALUES ('0', '150');
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SELECT SQL_CALC_FOUND_ROWS DISTINCT email FROM t2 LEFT JOIN t1 ON kid = t2.id WHERE t1.id IS NULL LIMIT 10;
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email
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email1
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email2
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email3
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email4
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email5
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email6
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email7
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email8
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email9
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email10
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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199
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drop table t1,t2;
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CREATE TABLE `t1` (
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`titre` char(80) NOT NULL default '',
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`numeropost` mediumint(8) unsigned NOT NULL auto_increment,
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`maxnumrep` int(10) unsigned NOT NULL default '0',
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PRIMARY KEY (`numeropost`),
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KEY `maxnumrep` (`maxnumrep`)
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) ENGINE=MyISAM ROW_FORMAT=FIXED;
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INSERT INTO t1 (titre,maxnumrep) VALUES
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('test1','1'),('test2','2'),('test3','3');
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SELECT SQL_CALC_FOUND_ROWS titre,numeropost,maxnumrep FROM t1 WHERE numeropost IN (1,2) ORDER BY maxnumrep DESC LIMIT 0, 1;
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titre numeropost maxnumrep
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test2 2 2
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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2
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SELECT SQL_CALC_FOUND_ROWS 1 FROM (SELECT 1) as a LIMIT 0;
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1
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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1
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 WHERE numeropost > 1 LIMIT 0;
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titre numeropost maxnumrep
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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2
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 LIMIT 0;
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titre numeropost maxnumrep
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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3
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 ORDER BY numeropost LIMIT 0;
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titre numeropost maxnumrep
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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3
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drop table t1;
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create table t1 (id int, primary key (id));
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insert into t1 values (1), (2), (3), (4), (5);
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select SQL_CALC_FOUND_ROWS * from t1 where id > 3 limit 0, 1;
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id
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4
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select FOUND_ROWS();
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FOUND_ROWS()
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2
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select SQL_CALC_FOUND_ROWS * from t1 where id > 3 AND 1=2 limit 0, 1;
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id
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select FOUND_ROWS();
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FOUND_ROWS()
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0
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select SQL_CALC_FOUND_ROWS * from t1 where id > 6 limit 0, 1;
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id
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select FOUND_ROWS();
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FOUND_ROWS()
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0
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drop table t1;
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CREATE TABLE t1 ( a int not null, b int not null, KEY ab(a,b) );
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INSERT INTO t1 VALUES ( 47, 1 );
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INSERT INTO t1 VALUES ( 70, 1 );
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SELECT * FROM t1
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WHERE
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(
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( b =1 AND a BETWEEN 14 AND 21 ) OR
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( b =2 AND a BETWEEN 16 AND 18 ) OR
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( b =3 AND a BETWEEN 15 AND 19 )
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);
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a b
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DROP TABLE t1;
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CREATE TABLE t1 ( a integer, u varchar(15), r integer, key uao_idx( r, a, u));
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DELETE FROM t1
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WHERE ( r = 1 AND a IN ( 1, 2 ) AND ( u = 'w' OR u LIKE 'w/%' ) )
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OR ( r = 1 AND a IN ( 3 ) AND ( u = 'w/U' OR u LIKE 'w/U/%' ) )
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OR ( r = 1 AND a IN ( 1, 2, 3 ) AND ( u = 'w' ) );
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drop table t1;
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CREATE TABLE t1 (a VARCHAR(16), UNIQUE(a));
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INSERT INTO t1 VALUES ('1'), ('2'), ('3');
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 WHERE a = '2' LIMIT 0, 1;
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a
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2
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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1
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DROP TABLE t1;
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CREATE TABLE t1 (a INT);
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INSERT INTO t1 VALUES (0), (0), (1), (2);
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SELECT SQL_CALC_FOUND_ROWS * FROM t1 WHERE a = 0 GROUP BY a HAVING a > 10;
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a
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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0
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DROP TABLE t1;
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SELECT 'foo';
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foo
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foo
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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1
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SELECT SQL_CALC_FOUND_ROWS 'foo';
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foo
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foo
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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1
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SELECT SQL_CALC_FOUND_ROWS 'foo' limit 0;
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foo
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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1
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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1
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SELECT SQL_CALC_FOUND_ROWS 'foo' UNION SELECT 'bar' LIMIT 0;
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foo
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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2
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CREATE TABLE t1 (a int, b int);
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INSERT INTO t1 VALUES (1,2), (1,3), (1,4), (1,5);
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SELECT SQL_CALC_FOUND_ROWS DISTINCT 'a' FROM t1 GROUP BY b LIMIT 2;
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a
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a
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SELECT FOUND_ROWS();
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FOUND_ROWS()
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1
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DROP TABLE t1;
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