题解 | 2021年11月每天的人均浏览文章时长
2021年11月每天的人均浏览文章时长
https://www.nowcoder.com/practice/8e33da493a704d3da15432e4a0b61bb3
SELECT date dt,
ROUND(SUM(watch_time)/COUNT(DISTINCT uid),1) avg_viiew_len_sec
FROM(
SELECT uid, artical_id,
timestampdiff(SECOND,in_time,out_time) watch_time,
DATE(out_time) date
FROM tb_user_log
WHERE artical_id != 0 AND YEAR(out_time) = 2021 AND MONTH(out_time) = 11
) co
GROUP BY dt
ORDER BY 2
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