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 a.date, sum( if( a.date = b.date , 1, 0) ) as new from login a left join ( select user_id, min(date) as date from login group by user_id ) b on a.user_id = b.user_id group by date;
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