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
第一步 连接表
第二步 分组计算连接表，排序 完事
select g.id,g.name,g.weight,sum(t.count)
from goods as g
join trans as t
on g.id=t.goods_id
where g.weight<50
group by g.id,g.name,g.weight
having sum(count)>20
order by g.id;