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
with min_login as(
select user_id,min(date) as date
from login
group by user_id
)
select round(count(l2.user_id)/count(l1.user_id),3)
from min_login l1
left join login l2
on l1.user_id=l2.user_id and l2.date = date_add(l1.date,interval 1 day)
