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(distinct q2.device_id,q2.date)/count(DISTINCT q1.device_id,q1.date) as avg_ret from question_practice_detail as q1 left outer join question_practice_detail as q2 on q1.device_id=q2.device_id and DATEDIFF(q2.date,q1.date)=1
没写出来，也没看懂
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