题解 | 牛客每个人最近的登录日期(三)
牛客每个人最近的登录日期(三)
https://www.nowcoder.com/practice/16d41af206cd4066a06a3a0aa585ad3d
select round(count(distinct t2.user_id)/count(distinct t1.user_id),3) as p from (select user_id,date from login)t1 left join (select user_id,date from login)t2 on t1.user_id=t2.user_id and t2.date=date_add(t1.date,interval 1 day)
