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 (
    SELECT order_num, SUM(quantity)
    FROM OrderItems
    GROUP BY order_num
    HAVING SUM(quantity) >= 100
) a
ORDER BY order_num

题解:

1.任务:查询订单号

2.限制:订单数量总和不低于100

3.排序

思路:

1.先写查询语句,查询订单号

2.要计算每个订单号的订单数量之和,使用sum函数和group by语句,

3.排序order by

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