LeetCode（数据库）- 餐馆营业额变化增长

Posted 2021-09-30 程序员牧码

题目链接：点击打开链接

题目大意：略。

解题思路：略。

AC 代码

SELECT
	a.visited_on,
	sum( b.amount ) AS amount,
	round(sum( b.amount ) / 7, 2 ) AS average_amount 
FROM
	( SELECT DISTINCT visited_on FROM customer ) a JOIN customer b 
 	ON datediff( a.visited_on, b.visited_on ) BETWEEN 0 AND 6 
WHERE
	a.visited_on >= (SELECT min( visited_on ) FROM customer ) + 6 
GROUP BY
	a.visited_on