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fixing EXPLAIN select types

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unknown
2002-10-03 18:47:04 +03:00
parent c9a2b58986
commit f094b6af4c
25 changed files with 189 additions and 187 deletions
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52
mysql-test/r/null_key.result
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@ -3,37 +3,37 @@ create table t1 (a int, b int not null,unique key (a,b),index(b)) type=myisam;
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);
explain select * from t1 where a is null;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 ref a a 5 const 3 where used; Using index
1 SIMPLE t1 ref a a 5 const 3 where used; Using index
explain select * from t1 where a is null and b = 2;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 ref a,b a 9 const,const 1 where used; Using index
1 SIMPLE t1 ref a,b a 9 const,const 1 where used; Using index
explain select * from t1 where a is null and b = 7;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 ref a,b a 9 const,const 1 where used; Using index
1 SIMPLE t1 ref a,b a 9 const,const 1 where used; Using index
explain select * from t1 where a=2 and b = 2;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 const a,b a 9 const,const 1
1 SIMPLE t1 const a,b a 9 const,const 1
explain select * from t1 where a<=>b limit 2;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 index NULL a 9 NULL 12 where used; Using index
1 SIMPLE t1 index NULL a 9 NULL 12 where used; Using index
explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 limit 3;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 range a,b a 9 NULL 3 where used; Using index
1 SIMPLE t1 range a,b a 9 NULL 3 where used; Using index
explain select * from t1 where (a is null or a = 7) and b=7;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 ref a,b b 4 const 2 where used
1 SIMPLE t1 ref a,b b 4 const 2 where used
explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 ref a,b a 5 const 3 where used; Using index
1 SIMPLE t1 ref a,b a 5 const 3 where used; Using index
explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 range a,b a 9 NULL 2 where used; Using index
1 SIMPLE t1 range a,b a 9 NULL 2 where used; Using index
explain select * from t1 where a > 1 and a < 3 limit 1;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 range a a 5 NULL 1 where used; Using index
1 SIMPLE t1 range a a 5 NULL 1 where used; Using index
explain select * from t1 where a > 8 and a < 9;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 range a a 5 NULL 1 where used; Using index
1 SIMPLE t1 range a a 5 NULL 1 where used; Using index
select * from t1 where a is null;
a b
NULL 7
@ -66,43 +66,43 @@ NULL 9
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));
explain select * from t1 where a is null and b = 2;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 ref a,b a 5 const 3 where used
1 SIMPLE t1 ref a,b a 5 const 3 where used
explain select * from t1 where a is null and b = 2 and c=0;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 ref a,b a 5 const 3 where used
1 SIMPLE t1 ref a,b a 5 const 3 where used
explain select * from t1 where a is null and b = 7 and c=0;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 ref a,b a 5 const 3 where used
1 SIMPLE t1 ref a,b a 5 const 3 where used
explain select * from t1 where a=2 and b = 2;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 ref a,b a 5 const 1 where used
1 SIMPLE t1 ref a,b a 5 const 1 where used
explain select * from t1 where a<=>b limit 2;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 ALL NULL NULL NULL NULL 12 where used
1 SIMPLE t1 ALL NULL NULL NULL NULL 12 where used
explain select * from t1 where (a is null or a > 0 and a < 3) and b < 5 and c=0 limit 3;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 range a,b a 5 NULL 5 where used
1 SIMPLE t1 range a,b a 5 NULL 5 where used
explain select * from t1 where (a is null or a = 7) and b=7 and c=0;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 range a,b a 5 NULL 4 where used
1 SIMPLE t1 range a,b a 5 NULL 4 where used
explain select * from t1 where (a is null and b>a) or a is null and b=7 limit 2;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 ref a,b a 5 const 3 where used
1 SIMPLE t1 ref a,b a 5 const 3 where used
explain select * from t1 where a is null and b=9 or a is null and b=7 limit 3;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 ref a,b a 5 const 3 where used
1 SIMPLE t1 ref a,b a 5 const 3 where used
explain select * from t1 where a > 1 and a < 3 limit 1;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 range a a 5 NULL 1 where used
1 SIMPLE t1 range a a 5 NULL 1 where used
explain select * from t1 where a is null and b=7 or a > 1 and a < 3 limit 1;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 range a,b a 5 NULL 4 where used
1 SIMPLE t1 range a,b a 5 NULL 4 where used
explain select * from t1 where a > 8 and a < 9;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 range a a 5 NULL 1 where used
1 SIMPLE t1 range a a 5 NULL 1 where used
explain select * from t1 where b like "6%";
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 range b b 12 NULL 1 where used
1 SIMPLE t1 range b b 12 NULL 1 where used
select * from t1 where a is null;
a b c
NULL 7 0
@ -152,10 +152,10 @@ INSERT INTO t1 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4
INSERT INTO t2 VALUES (1,NULL),(2,NULL),(3,1),(4,2),(5,NULL),(6,NULL),(7,3),(8,4),(9,NULL),(10,NULL);
explain select id from t1 where uniq_id is null;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 ref idx1 idx1 5 const 1 where used
1 SIMPLE t1 ref idx1 idx1 5 const 1 where used
explain select id from t1 where uniq_id =1;
id select_type table type possible_keys key key_len ref rows Extra
1 FIRST t1 const idx1 idx1 5 const 1
1 SIMPLE t1 const idx1 idx1 5 const 1
UPDATE t1 SET id=id+100 where uniq_id is null;
UPDATE t2 SET id=id+100 where uniq_id is null;
select id from t1 where uniq_id is null;