题解 | #返回订单数量总和不小于100的所有订单的订单号#
返回订单数量总和不小于100的所有订单的订单号
https://www.nowcoder.com/practice/ff77e82b59544a15987324e19488aafd
select order_num from OrderItems group by order_num having sum(quantity)>=100 order by order_num;
对于条件筛选有两个关键词 where 和 having，其中如果筛选在group by之后，则应该是用having。
，再说不用上高数吗？