题解 | #计算用户的平均次日留存率#
计算用户的平均次日留存率
https://www.nowcoder.com/practice/126083961ae0415fbde061d7ebbde453
select
count(t1.date) / count(qpd.date) as avg_ret
from (
select
distinct
device_id,
date_sub(date, interval 1 day) as date
from
question_practice_detail
) as t1
right join (
select
distinct
device_id,
date
from
question_practice_detail
) as qpd on qpd.date = t1.date
and qpd.device_id = t1.device_id;
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