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43 lines
1.7 KiB
Plaintext
43 lines
1.7 KiB
Plaintext
drop table if exists t1;
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drop table if exists t2;
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create table t1 (p int not null primary key, u int not null, o int not null,
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unique (u), key(o)) engine=ndb;
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create table t2 (p int not null primary key, u int not null, o int not null,
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unique (u), key(o)) engine=ndb;
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insert into t1 values (1,1,1),(2,2,2),(3,3,3);
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insert into t2 values (1,1,1),(2,2,2),(3,3,3), (4,4,4), (5,5,5);
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explain select * from t2 where p NOT IN (select p from t1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where
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2 DEPENDENT SUBQUERY t1 unique_subquery PRIMARY PRIMARY 4 func 1 Using index
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select * from t2 where p NOT IN (select p from t1) order by p;
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p u o
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4 4 4
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5 5 5
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explain select * from t2 where p NOT IN (select u from t1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where
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2 DEPENDENT SUBQUERY t1 unique_subquery u u 4 func 1 Using index
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select * from t2 where p NOT IN (select u from t1) order by p;
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p u o
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4 4 4
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5 5 5
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explain select * from t2 where p NOT IN (select o from t1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where
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2 DEPENDENT SUBQUERY t1 index_subquery o o 4 func 1 Using index
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select * from t2 where p NOT IN (select o from t1) order by p;
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p u o
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4 4 4
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5 5 5
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explain select * from t2 where p NOT IN (select p+0 from t1);
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t2 ALL NULL NULL NULL NULL 5 Using where
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2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 3 Using where
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select * from t2 where p NOT IN (select p+0 from t1) order by p;
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p u o
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4 4 4
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5 5 5
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drop table t1;
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drop table t2;
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