把内层sql语句查询的结果作为临时表供外层sql语句再次查询.
select goods_id, goods_name from goods where goods_id between 20 and 25;
select goods_id, goods_name, cat_id from goods order by cat_id asc, goods_id desc;
select goods_id, cat_id, goods_name from (select goods_id, goods_name, cat_id from goods order by cat_id asc, goods_id desc) as tmp group by cat_id;
时间: 2024-10-19 12:19:27