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
http://www.nowcoder.com/practice/8e33da493a704d3da15432e4a0b61bb3
select date(in_time) as dt, round(sum(timestampdiff(SECOND,in_time,out_time))/count(distinct uid),1) as avg_view_len_sec from tb_user_log where year(in_time)=2021 and month(in_time) = 11 and artical_id != 0 group by dt order by 2
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