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15 lines
1.2 KiB
SQL
15 lines
1.2 KiB
SQL
explain
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select (
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select count(*) from sakila.film_actor
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where sakila.film_actor.actor_id = sakila.actor.actor_id
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) + (
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select count(*) from sakila.film as f
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) as count_actors from sakila.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 index |
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| 3 | SUBQUERY | f | index | NULL | idx_fk_language_id | 1 | NULL | 951 | Using index |
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| 2 | DEPENDENT SUBQUERY | film_actor | ref | PRIMARY | PRIMARY | 2 | actor.actor_id | 13 | Using where; Using index |
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+----+--------------------+------------+-------+---------------+--------------------+---------+----------------+------+--------------------------+
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