题解 | 日活与每日次日留存率
select t1.visit_date, count(t1.id) dau, count(t2.id) / count(t1.id) next_day_per from user_visit_log t1 left join user_visit_log t2 on t1.id = t2.id and datediff (t2.visit_date, t1.visit_date) = 1 group by t1.visit_date
select t1.visit_date, count(t1.id) dau, count(t2.id) / count(t1.id) next_day_per from user_visit_log t1 left join user_visit_log t2 on t1.id = t2.id and datediff (t2.visit_date, t1.visit_date) = 1 group by t1.visit_date
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