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
having 函数， where 不能够使用聚合函数只能使用having 或者是 子查询
