mysql> explain select distinct film.* from sakila.film join sakila.film_actor using(film_id) where film.film_id % 5 = 0;
+----+-------------+------------+------+----------------+----------------+---------+---------------------+------+------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
+----+-------------+------------+------+----------------+----------------+---------+---------------------+------+------------------------------+
| 1 | SIMPLE | film | ALL | PRIMARY | NULL | NULL | NULL | 951 | Using where; Using temporary |
| 1 | SIMPLE | film_actor | ref | idx_fk_film_id | idx_fk_film_id | 2 | sakila.film.film_id | 2 | Using index; Distinct |
+----+-------------+------------+------+----------------+----------------+---------+---------------------+------+------------------------------+
2 rows in set (0.00 sec)
mysql> notee
|