题解 | #平均活跃天数和月活人数#
平均活跃天数和月活人数
https://www.nowcoder.com/practice/9e2fb674b58b4f60ac765b7a37dde1b9
select date_format(submit_time,'%Y%m') `month`, round(count(distinct concat(uid, date_format(submit_time,'%Y%m%d')))/ count(distinct uid),2) avg_active_days, round(count(distinct uid),2) mau from exam_record where year(submit_time) = '2021' group by date_format(submit_time,'%Y%m');
