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 (start_time, '%Y%m') month,
round(
count(distinct uid, day (start_time)) / count(distinct uid)
,
2
) avg_active_days,
count(distinct uid) mau
from
exam_record
where
submit_time is not null
and year (start_time) = '2021'
group by month;
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