题解 | #牛客每个人最近的登录日期(四)#
牛客每个人最近的登录日期(四)
https://www.nowcoder.com/practice/e524dc7450234395aa21c75303a42b0a
SELECT `date`,SUM(IF(`date`=new_date,1,0)) FROM ( SELECT user_id,`date`, FIRST_VALUE(`date`) over(PARTITION by user_id ORDER BY `date`) new_date FROM login ) t1 GROUP BY `date` ORDER BY `date`
