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
新加一列注册日期，注册日期就是登入日期最小值，统计登入日期等于注册日期的行
select date
,sum(if(date=reg_date,1,0)) as new
from
(
select user_id
,date
,min(date) over (partition by user_id) as reg_date
from login
) as a
group by date
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