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 q1
LEFT JOIN question_practice_detail q2
ON q1.device_id=q2.device_id and datediff(q1.date,q2.date)=1
FROM question_practice_detail q1
LEFT JOIN question_practice_detail q2
ON q1.device_id=q2.device_id and datediff(q1.date,q2.date)=1
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