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
t1.date
,sum(case when t1.date = t2.first_date then 1 else 0 end) as `NEW`
from
login t1
inner join (
select
user_id
,min(date) as `first_date`
from
login
group by 1
) t2 on t1.user_id = t2.user_id
group by 1
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