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?tpId=268&tqId=2285342&ru=/exam/oj&qru=/ta/sql-factory-interview/question-ranking&sourceUrl=%2Fexam%2Foj
select date(in_time) as dt,
round(sum(TIMESTAMPDIFF(second,in_time,out_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(in_time)
order by avg_viiew_len_sec
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