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_format(in_time,'%Y-%m-%d') dt, round(sum(timestampdiff(second,in_time,out_time))/count(DISTINCT uid),1) avg_viiew_len_sec FROM tb_user_log WHERE date_format(in_time,'%Y-%m') ='2021-11' AND artical_id!=0 GROUP BY date_format(in_time,'%Y-%m-%d') ORDER BY 2
- 筛选月份,artical_id条件
- 按每天分组,取每天阅读总时间,除以每天阅读用户

