mysql> explain partitions select count(1) from user_partition where id in (1,详解2,3,4,5);

+----+-------------+----------------+------------+-------+---------------+---------+---------+------+------+--------------------------+

| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | Extra |

+----+-------------+----------------+------------+-------+---------------+---------+---------+------+------+--------------------------+

| 1 | SIMPLE | user_partition | p1,p4 | range | PRIMARY | PRIMARY | 8 | NULL | 5 | Using where; Using index |

+----+-------------+----------------+------------+-------+---------------+---------+---------+------+------+--------------------------+

1 row in set (0.00 sec)

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