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
使用having条件语句，附加SQL执行的顺序：
From..... → where条件语句 → group by 分组 → 聚合函数计算 → having条件语句 → order by 排序语句
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