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
子查询聚合函数与外联结的结合使用
select a.id, a.name, a.weight, b.total from goods a left join
(select goods_id, sum(count) as total from trans group by goods_id) b
on a.id = b.goods_id
where b.total > 20 and a.weight < 50;
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