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 (sum(if(d=d1,1,0)))/count(device_id)
from
(
select device_id,
lead(date,1,0)over(partition by device_id) d,
date_format(date+1,'%Y-%m-%d')as d1
from
(
select distinct device_id,date
from question_practice_detail
order by device_id,date
)a
)b
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