题解 | #牛客的课程订单分析(一)#
商品交易(网易校招笔试真题)
http://www.nowcoder.com/practice/f257dfc1b55e42e19eec004aa3cb4174
select id,name,weight,total from goods , (select t.goods_id , sum(t.count) as total from trans t group by t.goods_id) ts where goods.id = ts.goods_id and (goods.weight<50 and ts.total > 20)
简简单单，照着条件写就行
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