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(in_time) dt,
round(sum(timestampdiff(second,in_time,out_time))/count(distinct uid),1) avg_viiew_len_sec
from (
select uid,in_time,out_time
from tb_user_log
where month(in_time) = 11 and month(out_time) = 11 and sign_in = 0
) t1
group by dt
order by avg_viiew_len_sec
