LeetCode（数据库）- 活跃用户

Posted 2021-10-23 程序员牧码

题目链接：点击打开链接

题目大意：略。

解题思路：如图所示解决方案此类题必杀技。

AC 代码

WITH t1 AS(SELECT * FROM Logins GROUP BY id, login_date)

SELECT DISTINCT t1_5.id, name
FROM t1 t1_1 JOIN t1 t1_2 ON t1_1.id = t1_2.id AND DATEDIFF(t1_2.login_date, t1_1.login_date) = 1
JOIN t1 t1_3 ON t1_3.id = t1_2.id AND DATEDIFF(t1_3.login_date, t1_2.login_date) = 1
JOIN t1 t1_4 ON t1_4.id = t1_3.id AND DATEDIFF(t1_4.login_date, t1_3.login_date) = 1
JOIN t1 t1_5 ON t1_5.id = t1_4.id AND DATEDIFF(t1_5.login_date, t1_4.login_date) = 1
JOIN Accounts a ON a.id = t1_5.id
ORDER BY t1_5.id