mirror of
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196 lines
12 KiB
Text
196 lines
12 KiB
Text
drop table if exists t0,t1,t2;
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select count(*) from t1;
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count(*)
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64801
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explain select key1,key2 from t1 where key1=100 and key2=100;
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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 5,5 NULL 3 Using intersect(key1,key2); Using where; Using index
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select key1,key2 from t1 where key1=100 and key2=100;
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key1 key2
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100 100
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explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
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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,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
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select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
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key1 key2 key3 key4 filler1
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100 100 100 100 key1-key2-key3-key4
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insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, -1, -1, 'key1-key2');
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insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, 100, 100, 'key4-key3');
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explain select key1,key2,filler1 from t1 where key1=100 and key2=100;
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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 5,5 NULL 3 Using intersect(key1,key2); Using where
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select key1,key2,filler1 from t1 where key1=100 and key2=100;
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key1 key2 filler1
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100 100 key1-key2-key3-key4
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100 100 key1-key2
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explain select key1,key2 from t1 where key1=100 and key2=100;
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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 5,5 NULL 3 Using intersect(key1,key2); Using where; Using index
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select key1,key2 from t1 where key1=100 and key2=100;
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key1 key2
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100 100
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100 100
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explain select key1,key2,key3,key4 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
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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,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
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select key1,key2,key3,key4 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
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key1 key2 key3 key4
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100 100 100 100
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100 100 -1 -1
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-1 -1 100 100
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explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
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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,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
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select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
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key1 key2 key3 key4 filler1
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100 100 100 100 key1-key2-key3-key4
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100 100 -1 -1 key1-key2
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-1 -1 100 100 key4-key3
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explain select key1,key2,key3 from t1 where key1=100 and key2=100 and key3=100;
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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,key3 key1,key2,key3 5,5,5 NULL 1 Using intersect(key1,key2,key3); Using where; Using index
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select key1,key2,key3 from t1 where key1=100 and key2=100 and key3=100;
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key1 key2 key3
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100 100 100
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insert into t1 (key1,key2,key3,key4,filler1) values (101,101,101,101, 'key1234-101');
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explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=101;
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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,key3 key1,key2,key3 5,5,5 NULL 5 Using union(intersect(key1,key2),key3); Using where
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select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=101;
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key1 key2 key3 key4 filler1
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100 100 100 100 key1-key2-key3-key4
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100 100 -1 -1 key1-key2
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101 101 101 101 key1234-101
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select key1,key2, filler1 from t1 where key1=100 and key2=100;
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key1 key2 filler1
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100 100 key1-key2-key3-key4
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100 100 key1-key2
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update t1 set filler1='to be deleted' where key1=100 and key2=100;
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update t1 set key1=200,key2=200 where key1=100 and key2=100;
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delete from t1 where key1=200 and key2=200;
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select key1,key2,filler1 from t1 where key2=100 and key2=200;
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key1 key2 filler1
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explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
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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,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
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select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
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key1 key2 key3 key4 filler1
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-1 -1 100 100 key4-key3
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delete from t1 where key3=100 and key4=100;
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explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
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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,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
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select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
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key1 key2 key3 key4 filler1
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explain select key1,key2 from t1 where key1=100 and key2=100;
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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 5,5 NULL 3 Using intersect(key1,key2); Using where; Using index
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select key1,key2 from t1 where key1=100 and key2=100;
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key1 key2
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insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-1');
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insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-2');
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insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-3');
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explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
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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,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 16 Using union(key3,intersect(key1,key2),key4); Using where
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select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
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key1 key2 key3 key4 filler1
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100 100 200 200 key1-key2-key3-key4-3
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100 100 200 200 key1-key2-key3-key4-2
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100 100 200 200 key1-key2-key3-key4-1
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insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, -1, 200,'key4');
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explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
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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,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 18 Using union(key3,intersect(key1,key2),key4); Using where
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select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
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key1 key2 key3 key4 filler1
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100 100 200 200 key1-key2-key3-key4-3
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100 100 200 200 key1-key2-key3-key4-2
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100 100 200 200 key1-key2-key3-key4-1
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-1 -1 -1 200 key4
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insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, 200, -1,'key3');
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explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
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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,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 20 Using union(key3,intersect(key1,key2),key4); Using where
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select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
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key1 key2 key3 key4 filler1
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100 100 200 200 key1-key2-key3-key4-3
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100 100 200 200 key1-key2-key3-key4-2
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100 100 200 200 key1-key2-key3-key4-1
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-1 -1 -1 200 key4
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-1 -1 200 -1 key3
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explain select * from t1 where st_a=1 and st_b=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 sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b st_a,st_b 4,4 NULL 2508 Using intersect(st_a,st_b); Using where
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explain select st_a,st_b from t1 where st_a=1 and st_b=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 sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b st_a,st_b 4,4 NULL 2508 Using intersect(st_a,st_b); Using where; Using index
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explain select st_a from t1 ignore index (st_a) where st_a=1 and st_b=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 ref sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,stb_swt1a_2b,stb_swt1b,st_b st_b 4 const 14720 Using where
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explain select * from t1 where st_a=1 and swt1a=1 and swt2a=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 ref sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a sta_swt12a 12 const,const,const 958 Using where
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explain select * from t1 where st_b=1 and swt1b=1 and swt2b=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 ref stb_swt1a_2b,stb_swt1b,st_b stb_swt1b 8 const,const 3757 Using where
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explain select * from t1 where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=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 sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a,stb_swt1a_2b 12,12 NULL 42 Using intersect(sta_swt12a,stb_swt1a_2b); Using where
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explain select * from t1 ignore index (sta_swt21a, stb_swt1a_2b)
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where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=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 sta_swt12a,sta_swt1a,sta_swt2a,st_a,stb_swt1b,st_b sta_swt12a,stb_swt1b 12,8 NULL 42 Using intersect(sta_swt12a,stb_swt1b); Using where
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explain select * from t1 ignore index (sta_swt21a, sta_swt12a, stb_swt1a_2b)
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where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=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 sta_swt1a,sta_swt2a,st_a,stb_swt1b,st_b sta_swt1a,sta_swt2a,stb_swt1b 8,8,8 NULL 41 Using intersect(sta_swt1a,sta_swt2a,stb_swt1b); Using where
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explain select * from t1 ignore index (sta_swt21a, sta_swt12a, stb_swt1a_2b, stb_swt1b)
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where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=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 sta_swt1a,sta_swt2a,st_a,st_b sta_swt1a,sta_swt2a,st_b 8,8,4 NULL 159 Using intersect(sta_swt1a,sta_swt2a,st_b); Using where
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explain select * from t1
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where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=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 sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a,stb_swt1a_2b 12,12 NULL 42 Using intersect(sta_swt12a,stb_swt1a_2b); Using where
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explain select * from t1
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where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=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 sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 163 Using intersect(sta_swt1a,stb_swt1b); Using where
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explain select st_a from t1
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where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=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 sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 163 Using intersect(sta_swt1a,stb_swt1b); Using where; Using index
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explain select st_a from t1
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where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=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 sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 163 Using intersect(sta_swt1a,stb_swt1b); Using where; Using index
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drop table t0,t1;
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create table t2 (
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a char(10),
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b char(10),
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filler1 char(255),
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filler2 char(255),
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key(a(5)),
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key(b(5))
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);
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select count(a) from t2 where a='BBBBBBBB';
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count(a)
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4
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select count(a) from t2 where b='BBBBBBBB';
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count(a)
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4
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explain select count(a) from t2 where a='AAAAAAAA' and b='AAAAAAAA';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref a,b a 6 const 4 Using where
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select count(a) from t2 where a='AAAAAAAA' and b='AAAAAAAA';
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count(a)
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4
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select count(a) from t2 ignore index(a,b) where a='AAAAAAAA' and b='AAAAAAAA';
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count(a)
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4
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insert into t2 values ('ab', 'ab', 'uh', 'oh');
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explain select a from t2 where a='ab';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 ref a a 6 const 1 Using where
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drop table t2;
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