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 date,if(sum is not null,sum,0) from login left join (select mdate,count(*) sum from( select user_id,min(date) mdate from login group by user_id) as t1 group by mdate) as t2 on login.date = mdate
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