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(in_time,'%Y-%m-%d') as dt,
round(sum(unix_timestamp(out_time)-unix_timestamp(in_time))/count(distinct uid),1) as avg_viiew_len_sec
from tb_user_log
where date_format(in_time,'%Y-%m')='2021-11' and artical_id != 0
group by date_format(in_time,'%Y-%m-%d')
order by avg_viiew_len_sec
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