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