mirror of
https://github.com/percona/percona-toolkit.git
synced 2025-09-10 05:00:45 +00:00
11 lines
816 B
SQL
11 lines
816 B
SQL
mysql> explain select actor_id, (select @foo := coalesce(@foo, 0) + 1 from sakila.actor) as foo from sakila.actor;
|
|
+----+----------------------+-------+-------+---------------+---------+---------+------+------+-------------+
|
|
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra |
|
|
+----+----------------------+-------+-------+---------------+---------+---------+------+------+-------------+
|
|
| 1 | PRIMARY | actor | index | NULL | PRIMARY | 2 | NULL | 200 | Using index |
|
|
| 2 | UNCACHEABLE SUBQUERY | actor | index | NULL | PRIMARY | 2 | NULL | 200 | Using index |
|
|
+----+----------------------+-------+-------+---------------+---------+---------+------+------+-------------+
|
|
2 rows in set (0.00 sec)
|
|
|
|
mysql> notee
|