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 distinct l2.date ,sum(case when l2.date=l1.date then 1 else 0 end )
from
(select user_id,min(date) as date from login group by user_id)l1
join login as l2 on l1.user_id=l2.user_id
group by l2.date
order by l2.date asc
