题解 | 牛客每个人最近的登录日期(四)
select t.date,sum( IF(t.r=1,1,0)) as new
from (
select date ,row_number()over(partition by user_id order by date)r
from login
)t
group by t.date
select t.date,sum( IF(t.r=1,1,0)) as new
from (
select date ,row_number()over(partition by user_id order by date)r
from login
)t
group by t.date
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