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) from tb_user_log where date_format(in_time,'%Y-%m')='2021-11' and artical_id != 0 group by dt order by 2
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