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11 lines
960 B
SQL
11 lines
960 B
SQL
mysql> explain select count(*) from sakila.actor where actor_id in (select actor_id from sakila.film_actor);
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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 | actor | index | NULL | PRIMARY | 2 | NULL | 200 | Using where; Using index |
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| 2 | DEPENDENT SUBQUERY | film_actor | index_subquery | PRIMARY | PRIMARY | 2 | func | 13 | Using index |
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+----+--------------------+------------+----------------+---------------+---------+---------+------+------+--------------------------+
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2 rows in set (0.00 sec)
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mysql> notee
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