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') as month,
round(
count(distinct concat (date (submit_time), uid)) / count(distinct uid),
2
) as avg_active_days,
count(distinct uid) as mau
from
exam_record
where
year (submit_time) = 2021
group by
month
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