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(l.date) / count(*),3) as p
from login as l
right join (
select user_id
,min(date) first_dt
from login
group by user_id
) as t1
on l.date = date_add(t1.first_dt,interval 1 day)
and l.user_id = t1.user_id
from login as l
right join (
select user_id
,min(date) first_dt
from login
group by user_id
) as t1
on l.date = date_add(t1.first_dt,interval 1 day)
and l.user_id = t1.user_id
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