(资料图片)

目录

一、创建一张包含每个用户最早登入日期的表

select user_id,min(date) as first_day
from a2_userbehavior_csv
group by user_id

二、创建一张包含每个用户所有登入日期的表

实际上就是对用户和日期去重

select user_id,date
from a2_userbehavior_csv
group by user_id,date

三、将两个表按照user_id拼接，并且计算日期时间差

select t1.*,t2.date,datediff(t2.date,t1.first_day) as day_diff
from 
(select user_id,min(date) as first_day
from a2_userbehavior_csv
group by user_id) as t1
left join 
(select user_id,date
from a2_userbehavior_csv
group by user_id,date) as t2
on t1.user_id=t2.user_id

得到结果如下：

得到了每个用户每个登入日期距离其最早登入日期的天数。

四、计算各种留存率

现在思路就明朗了。

次日留存率=（day_diff=1的数量）/（day_diff=0的数量）

三日留存率=（day_diff=3的数量）/（day_diff=0的数量）

select first_day as dt,
	   concat(round(100*count(case when day_diff=1 then user_id end)/count(case when day_diff=0 then user_id end),2),"%") as "次日留存率",
	   concat(round(100*count(case when day_diff=3 then user_id end)/count(case when day_diff=0 then user_id end),2),"%") as "三日留存率",
	   concat(round(100*count(case when day_diff=7 then user_id end)/count(case when day_diff=0 then user_id end),2),"%") as "七日留存率"
from
(select t1.*,t2.date,datediff(t2.date,t1.first_day) as day_diff
from 
(select user_id,min(date) as first_day
from a2_userbehavior_csv
group by user_id) as t1
left join 
(select user_id,date
from a2_userbehavior_csv
group by user_id,date) as t2
on t1.user_id=t2.user_id) as t3
group by first_day 
order by first_day

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