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 (a.in_time, '%Y-%m-%d') dt,
round(
sum(timestampdiff (second, a.in_time, a.out_time)) / count(distinct a.uid),
1
) avg_viiew_len_sec
from
tb_user_log a
where
year (a.in_time) = 2021
and month (a.in_time) = 11
and artical_id !=0
group by
dt
order by
avg_viiew_len_sec