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-------+------------+-------+---------------+---------+---------+-------+------+-------+ | id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+------------+------------+-------+---------------+---------+---------+-------+------+-------+ | 1 | SIMPLE | actor_part | p2 | const | PRIMARY | PRIMARY | 2 | const | 1 | NULL | +----+-------------+------------+------------+-------+---------------+---------+---------+-------+------+-------+ 1 row in set (0.00 sec) -- 多出了partitions列
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