MySQLのSQL文性能改善 categoryテーブル ---------------------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +---------------------------+--------------+------+-----+---------+-------+ | id | varchar(32) | | PRI | | | | name | varchar(128) | | | | | | keywords | text | YES | | NULL | | | parent_id | varchar(32) | | | | | +---------------------------+------