LeetCode（数据库）- 列出指定时间段内所有的下单产品

题目链接：​​点击打开链接​​

题目大意：略。

解题思路：略。

AC 代码

SELECT product_name, sumn unit
FROM Products p JOIN 
(SELECT product_id, SUM(unit) sumn
FROM Orders
WHERE DATE_FORMAT(order_date, '%Y-%m') = '2020-02'
GROUP BY product_id
HAVING sumn >= 100) rs
ON p.product_id = rs.product_id