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 date, count(distinct case when first_day=date then user_id end) as new from ( select user_id, date, min(date) over(partition by user_id ) as first_day from login ) t group by date order by date;