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(date2)/count(date1) from (select distinct device_id, date as date1 from question_practice_detail) as d1 left join (select distinct device_id, date_add(date, interval 1 day) as date2 from question_practice_detail) as d2 on d1.device_id = d2.device_id and d1.date1 = d2.date2
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