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 day,
round(sum(second_sum)/count(uid),1) time_avg
from
(select substr(in_time,1,10) day,
uid,
sum(timestampdiff(second,in_time,out_time)) second_sum
from tb_user_log
where substr(in_time,1,10) >='2021-11-01'
and artical_id !=0
group by substr(in_time,1,10),uid
) a
group by day
order by round(sum(second_sum)/count(uid),1)
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