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126 lines
3.9 KiB
Plaintext
126 lines
3.9 KiB
Plaintext
drop table if exists t1,t2;
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create table t1
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(
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key1 int not null,
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key2 int not null,
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INDEX i1(key1),
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INDEX i2(key2)
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) engine=innodb;
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explain select * from t1 where key1 < 5 or key2 > 197;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using sort_union(i1,i2); Using where
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select * from t1 where key1 < 5 or key2 > 197;
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key1 key2
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0 200
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1 199
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2 198
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3 197
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4 196
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explain select * from t1 where key1 < 3 or key2 > 195;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using sort_union(i1,i2); Using where
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select * from t1 where key1 < 3 or key2 > 195;
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key1 key2
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0 200
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1 199
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2 198
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3 197
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4 196
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alter table t1 add str1 char (255) not null,
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add zeroval int not null default 0,
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add str2 char (255) not null,
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add str3 char (255) not null;
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update t1 set str1='aaa', str2='bbb', str3=concat(key2, '-', key1 div 2, '_' ,if(key1 mod 2 = 0, 'a', 'A'));
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alter table t1 add primary key (str1, zeroval, str2, str3);
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explain select * from t1 where key1 < 5 or key2 > 197;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using sort_union(i1,i2); Using where
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select * from t1 where key1 < 5 or key2 > 197;
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key1 key2 str1 zeroval str2 str3
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4 196 aaa 0 bbb 196-2_a
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3 197 aaa 0 bbb 197-1_A
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2 198 aaa 0 bbb 198-1_a
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1 199 aaa 0 bbb 199-0_A
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0 200 aaa 0 bbb 200-0_a
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explain select * from t1 where key1 < 3 or key2 > 195;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using sort_union(i1,i2); Using where
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select * from t1 where key1 < 3 or key2 > 195;
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key1 key2 str1 zeroval str2 str3
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4 196 aaa 0 bbb 196-2_a
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3 197 aaa 0 bbb 197-1_A
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2 198 aaa 0 bbb 198-1_a
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1 199 aaa 0 bbb 199-0_A
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0 200 aaa 0 bbb 200-0_a
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drop table t1;
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create table t1 (
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pk integer not null auto_increment primary key,
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key1 integer,
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key2 integer not null,
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filler char (200),
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index (key1),
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index (key2)
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) engine=innodb;
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show warnings;
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Level Code Message
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explain select pk from t1 where key1 = 1 and key2 = 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge key1,key2 key1,key2 5,4 NULL 1 Using intersect(key1,key2); Using where; Using index
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select pk from t1 where key2 = 1 and key1 = 1;
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pk
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26
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27
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select pk from t1 ignore index(key1,key2) where key2 = 1 and key1 = 1;
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pk
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26
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27
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drop table t1;
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create table t1 (
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pk int primary key auto_increment,
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key1a int,
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key2a int,
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key1b int,
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key2b int,
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dummy1 int,
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dummy2 int,
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dummy3 int,
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dummy4 int,
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key3a int,
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key3b int,
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filler1 char (200),
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index i1(key1a, key1b),
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index i2(key2a, key2b),
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index i3(key3a, key3b)
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) engine=innodb;
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create table t2 (a int);
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insert into t2 values (0),(1),(2),(3),(4),(NULL);
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insert into t1 (key1a, key1b, key2a, key2b, key3a, key3b)
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select A.a, B.a, C.a, D.a, C.a, D.a from t2 A,t2 B,t2 C, t2 D;
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insert into t1 (key1a, key1b, key2a, key2b, key3a, key3b)
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select key1a, key1b, key2a, key2b, key3a, key3b from t1;
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insert into t1 (key1a, key1b, key2a, key2b, key3a, key3b)
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select key1a, key1b, key2a, key2b, key3a, key3b from t1;
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analyze table t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status OK
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select count(*) from t1;
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count(*)
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5184
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explain select count(*) from t1 where
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key1a = 2 and key1b is null and key2a = 2 and key2b is null;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge i1,i2 i1,i2 10,10 NULL 3 Using intersect(i1,i2); Using where; Using index
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select count(*) from t1 where
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key1a = 2 and key1b is null and key2a = 2 and key2b is null;
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count(*)
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4
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explain select count(*) from t1 where
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key1a = 2 and key1b is null and key3a = 2 and key3b is null;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index_merge i1,i3 i1,i3 10,10 NULL 3 Using intersect(i1,i3); Using where; Using index
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select count(*) from t1 where
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key1a = 2 and key1b is null and key3a = 2 and key3b is null;
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count(*)
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4
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drop table t1,t2;
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