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((sum(case when t2.date is not null then 1 else 0 end)/count(*)),3)
from
login t1
left join login t2 on t1.user_id = t2.user_id and t2.date = date_add(t1.date,interval 1 day)
where
t1.date = (
select
min(date)
from
login
where
user_id = t1.user_id
) -- 获取每个用户最新登陆时间
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