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,
count(distinct case when (user_id,date) in
(select user_id,min(date)
from login
group by user_id
)
then user_id else null end
) new
from login
group by date
order by date
