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
group_concat(distinct 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
year(in_time) = 2021
and
month(in_time) = 11
and
artical_id != 0
group by
day(in_time)
order by
avg_viiew_len_sec
