摘要: -- 从下面这张商品表里找出价格相等的商品的组合 select * from products p1LEFT JOIN products p2on p1.price = p2.price and p1.name > p2.namewhere p2.name is not null 阅读全文
posted @ 2019-08-28 19:06 newlangwen 阅读(319) 评论(0) 推荐(0) 编辑