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15 lines
1.1 KiB
SQL
15 lines
1.1 KiB
SQL
explain
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select actor_id,
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(select count(film_id) from sakila.film join sakila.film_actor using(film_id))
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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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| 2 | SUBQUERY | film | index | PRIMARY | idx_fk_language_id | 1 | NULL | 951 | Using index |
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| 2 | SUBQUERY | film_actor | ref | idx_fk_film_id | idx_fk_film_id | 2 | sakila.film.film_id | 2 | Using index |
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+----+-------------+------------+-------+----------------+--------------------+---------+---------------------+------+-------------+
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3 rows in set (0.00 sec)
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mysql> notee
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