题解 | #商品交易(网易校招笔试真题)#小白做法，双表链接，提取题目要求的条件即可
商品交易(网易校招笔试真题)
http://www.nowcoder.com/practice/f257dfc1b55e42e19eec004aa3cb4174
select
g.id,
g.name,
g.weight,
sum(t.count)
from goods g left join trans t on g.id=t.goods_id
where
g.weight<50
group by t.goods_id
having sum(t.count)>20
order by g.id
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