题解 | #商品交易(网易校招笔试真题)#
商品交易(网易校招笔试真题)
http://www.nowcoder.com/practice/f257dfc1b55e42e19eec004aa3cb4174
这题比较简单，表链接，先筛选，在聚合
select g.id, g.name, g.weight, sum(t.count) as total from trans t left join goods g on t.goods_id=g.id where weight<50 group by g.id order by g.id;