File: unique_subquery_in_where_clause.sql

package info (click to toggle)
percona-toolkit 3.2.1-1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm, bullseye, forky, sid, trixie
  • size: 68,916 kB
  • sloc: perl: 241,287; sql: 22,868; sh: 19,746; javascript: 6,799; makefile: 353; awk: 38; python: 30; sed: 1
file content (10 lines) | stat: -rw-r--r-- 1,007 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
 
mysql> explain select count(*) from sakila.film_actor where actor_id in(select actor_id from sakila.actor);
+----+--------------------+------------+-----------------+---------------+----------------+---------+------+------+--------------------------+
| id | select_type        | table      | type            | possible_keys | key            | key_len | ref  | rows | Extra                    |
+----+--------------------+------------+-----------------+---------------+----------------+---------+------+------+--------------------------+
|  1 | PRIMARY            | film_actor | index           | NULL          | idx_fk_film_id | 2       | NULL | 5143 | Using where; Using index | 
|  2 | DEPENDENT SUBQUERY | actor      | unique_subquery | PRIMARY       | PRIMARY        | 2       | func |    1 | Using index              | 
+----+--------------------+------------+-----------------+---------------+----------------+---------+------+------+--------------------------+
2 rows in set (0.01 sec)

mysql> notee