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
x1 dt,
round(sum(x2) / count(distinct x3), 1) avg_viiew_len_sec
from
(
select
date(t1.in_time) x1,
TIMESTAMPDIFF(second, t1.in_time, t1.out_time) x2,
t1.uid x3
from
tb_user_log t1
where
t1.artical_id != 0
and date_format(t1.in_time, '%Y-%m') = '2021-11'
) t2
group by
x1 order by avg_viiew_len_sec
