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(q2.device_id)/count(q1.device_id) as avg_ret from (select distinct device_id,date from question_practice_detail) as q1 left join (select distinct device_id,date from question_practice_detail) as q2 on q1.device_id=q2.device_id and q2.date=date_add(q1.date,interval 1 day);
而且一般说的也很宽泛 不是特指后端