有如下表数据: 获取“菜单”分类的子分类数据列表: SELECT a.cat_id, a.cat_name, a.sort_order AS parent_order, a.cat_id, b.cat_id AS child_id, b.cat_name AS child_nameFROM article_cat AS a JOIN article_cat AS b ON b.parent_id = a.cat_id ORDER BY parent_order ASC, a.cat_id ASC