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b631ea0188
Docs/manual.texi: Auto merged mysql-test/t/rpl000013.test: Auto merged mysql-test/t/rpl000016.test: Auto merged extra/resolveip.c: Auto merged sql/sql_base.cc: Auto merged sql/sql_insert.cc: Auto merged sql/slave.cc: Auto merged sql/sql_select.cc: Auto merged
191 lines
6.2 KiB
Text
191 lines
6.2 KiB
Text
drop table if exists t1;
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create table t1 (a int, b int not null,unique key (a,b),index(b)) type=myisam;
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insert ignore into t1 values (1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(null,7),(9,9),(8,8),(7,7),(null,9),(null,9),(6,6);
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explain select * from t1 where a is null;
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table type possible_keys key key_len ref rows Extra
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t1 ref a a 5 const 3 where used; Using index
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explain select * from t1 where a is null and b = 2;
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table type possible_keys key key_len ref rows Extra
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t1 ref a,b a 9 const,const 1 where used; Using index
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explain select * from t1 where a is null and b = 7;
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table type possible_keys key key_len ref rows Extra
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t1 ref a,b a 9 const,const 1 where used; Using index
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explain select * from t1 where a=2 and b = 2;
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table type possible_keys key key_len ref rows Extra
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t1 const a,b a 9 const,const 1
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explain select * from t1 where a<=>b limit 2;
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table type possible_keys key key_len ref rows Extra
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t1 index NULL a 9 NULL 12 where used; Using index
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explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
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table type possible_keys key key_len ref rows Extra
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t1 range a,b a 9 NULL 3 where used; Using index
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explain select * from t1 where (a is null or a = 7) and b=7;
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table type possible_keys key key_len ref rows Extra
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t1 ref a,b b 4 const 2 where used
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explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
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table type possible_keys key key_len ref rows Extra
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t1 ref a,b a 5 const 3 where used; Using index
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explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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table type possible_keys key key_len ref rows Extra
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t1 range a,b a 9 NULL 2 where used; Using index
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explain select * from t1 where a > 1 and a < 3 limit 1;
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table type possible_keys key key_len ref rows Extra
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t1 range a a 5 NULL 1 where used; Using index
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explain select * from t1 where a > 8 and a < 9;
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table type possible_keys key key_len ref rows Extra
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t1 range a a 5 NULL 1 where used; Using index
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select * from t1 where a is null;
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a b
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NULL 7
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NULL 9
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NULL 9
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select * from t1 where a is null and b = 7;
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a b
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NULL 7
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select * from t1 where a<=>b limit 2;
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a b
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1 1
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2 2
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select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
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a b
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1 1
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2 2
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select * from t1 where (a is null or a > 0 and a < 3) and b > 7 limit 3;
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a b
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NULL 9
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NULL 9
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select * from t1 where (a is null or a = 7) and b=7;
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a b
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NULL 7
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7 7
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select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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a b
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NULL 7
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NULL 9
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NULL 9
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alter table t1 modify b blob not null, add c int not null, drop key a, add unique key (a,b(20),c), drop key b, add key (b(10));
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explain select * from t1 where a is null and b = 2;
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table type possible_keys key key_len ref rows Extra
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t1 ref a,b a 5 const 3 where used
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explain select * from t1 where a is null and b = 2 and c=0;
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table type possible_keys key key_len ref rows Extra
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t1 ref a,b a 5 const 3 where used
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explain select * from t1 where a is null and b = 7 and c=0;
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table type possible_keys key key_len ref rows Extra
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t1 ref a,b a 5 const 3 where used
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explain select * from t1 where a=2 and b = 2;
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table type possible_keys key key_len ref rows Extra
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t1 ref a,b a 5 const 1 where used
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explain select * from t1 where a<=>b limit 2;
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table type possible_keys key key_len ref rows Extra
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t1 ALL NULL NULL NULL NULL 12 where used
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explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 and c=0 limit 3;
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table type possible_keys key key_len ref rows Extra
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t1 range a,b a 5 NULL 5 where used
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explain select * from t1 where (a is null or a = 7) and b=7 and c=0;
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table type possible_keys key key_len ref rows Extra
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t1 range a,b a 5 NULL 4 where used
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explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
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table type possible_keys key key_len ref rows Extra
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t1 ref a,b a 5 const 3 where used
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explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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table type possible_keys key key_len ref rows Extra
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t1 ref a,b a 5 const 3 where used
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explain select * from t1 where a > 1 and a < 3 limit 1;
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table type possible_keys key key_len ref rows Extra
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t1 range a a 5 NULL 1 where used
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explain select * from t1 where a is null and b=7 or a > 1 and a < 3 limit 1;
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table type possible_keys key key_len ref rows Extra
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t1 range a,b a 5 NULL 4 where used
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explain select * from t1 where a > 8 and a < 9;
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table type possible_keys key key_len ref rows Extra
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t1 range a a 5 NULL 1 where used
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explain select * from t1 where b like "6%";
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table type possible_keys key key_len ref rows Extra
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t1 range b b 12 NULL 1 where used
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select * from t1 where a is null;
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a b c
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NULL 7 0
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NULL 9 0
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NULL 9 0
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select * from t1 where a is null and b = 7 and c=0;
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a b c
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NULL 7 0
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select * from t1 where a<=>b limit 2;
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a b c
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1 1 0
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2 2 0
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select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
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a b c
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1 1 0
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2 2 0
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select * from t1 where (a is null or a > 0 and a < 3) and b > 7 limit 3;
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a b c
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NULL 9 0
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NULL 9 0
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select * from t1 where (a is null or a = 7) and b=7 and c=0;
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a b c
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NULL 7 0
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7 7 0
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select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
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a b c
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NULL 7 0
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NULL 9 0
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NULL 9 0
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select * from t1 where b like "6%";
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a b c
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6 6 0
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drop table t1;
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DROP TABLE IF EXISTS t1,t2;
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CREATE TABLE t1 (
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id int(10) unsigned NOT NULL auto_increment,
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uniq_id int(10) unsigned default NULL,
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PRIMARY KEY (id),
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UNIQUE KEY idx1 (uniq_id)
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) TYPE=MyISAM;
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CREATE TABLE t2 (
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id int(10) unsigned NOT NULL auto_increment,
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uniq_id int(10) unsigned default NULL,
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PRIMARY KEY (id)
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) TYPE=MyISAM;
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INSERT INTO t1 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
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INSERT INTO t2 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
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explain select id from t1 where uniq_id is null;
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table type possible_keys key key_len ref rows Extra
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t1 ref idx1 idx1 5 const 1 where used
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explain select id from t1 where uniq_id =1;
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table type possible_keys key key_len ref rows Extra
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t1 const idx1 idx1 5 const 1
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UPDATE t1 SET id=id+100 where uniq_id is null;
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UPDATE t2 SET id=id+100 where uniq_id is null;
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select id from t1 where uniq_id is null;
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id
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101
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102
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105
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106
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109
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110
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select id from t2 where uniq_id is null;
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id
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101
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102
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105
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106
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109
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110
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DELETE FROM t1 WHERE uniq_id IS NULL;
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DELETE FROM t2 WHERE uniq_id IS NULL;
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SELECT * FROM t1 ORDER BY uniq_id, id;
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id uniq_id
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3 1
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4 2
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7 3
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8 4
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SELECT * FROM t2 ORDER BY uniq_id, id;
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id uniq_id
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3 1
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4 2
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7 3
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8 4
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DROP table t1,t2;
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