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)
http://www.nowcoder.com/practice/e524dc7450234395aa21c75303a42b0a
with t as (
select user_id,date
from login
where (user_id,date) in (select user_id,min(date) from login group by user_id)
)
select t1.date,count(distinct t.user_id) as new
from t
right join login t1 on t.date = t1.date
group by t1.date
order by date
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