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20 lines
1.3 KiB
SQL
20 lines
1.3 KiB
SQL
explain
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select * from (
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select 1 as foo from sakila.actor as actor_1
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cross join sakila.actor as actor_2
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) as x
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inner join (
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select 1 as foo from sakila.actor as actor_3
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cross join sakila.actor as actor_4
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) as y using (foo);
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+----+-------------+------------+-------+---------------+---------+---------+------+-------+-------------+
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| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
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+----+-------------+------------+-------+---------------+---------+---------+------+-------+-------------+
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| 1 | PRIMARY | <derived2> | ALL | NULL | NULL | NULL | NULL | 40000 | |
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| 1 | PRIMARY | <derived3> | ALL | NULL | NULL | NULL | NULL | 40000 | Using where |
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| 3 | DERIVED | actor_3 | index | NULL | PRIMARY | 2 | NULL | 200 | Using index |
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| 3 | DERIVED | actor_4 | index | NULL | PRIMARY | 2 | NULL | 200 | Using index |
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| 2 | DERIVED | actor_1 | index | NULL | PRIMARY | 2 | NULL | 200 | Using index |
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| 2 | DERIVED | actor_2 | index | NULL | PRIMARY | 2 | NULL | 200 | Using index |
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+----+-------------+------------+-------+---------------+---------+---------+------+-------+-------------+
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