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
round(
sum(
CASE
WHEN p2.device_id IS NOT NULL THEN 1
ELSE 0
END
) / count(*),
4
) AS avg_ret
FROM
(
SELECT DISTINCT
device_id,
date
FROM
question_practice_detail
) p1
LEFT JOIN (
SELECT DISTINCT
device_id,
date
FROM
question_practice_detail
) p2 ON p1.device_id = p2.device_id
AND p2.date = Date_ADD(p1.date, INTERVAL 1 DAY)
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