mirror of
https://github.com/MariaDB/server.git
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67ce247965
Renamed HA_VAR_LENGTH to HA_VAR_LENGTH_PART Renamed in all files FIELD_TYPE_STRING and FIELD_TYPE_VAR_STRING to MYSQL_TYPE_STRING and MYSQL_TYPE_VAR_STRING to make it easy to catch all possible errors Added support for VARCHAR KEYS to heap Removed support for ISAM Now only long VARCHAR columns are changed to TEXT on demand (not CHAR) Internal temporary files can now use fixed length tables if the used VARCHAR columns are short
248 lines
5.4 KiB
Text
248 lines
5.4 KiB
Text
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 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 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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