题解 | #各个视频的平均完播率#
各个视频的平均完播率
http://www.nowcoder.com/practice/96263162f69a48df9d84a93c71045753
round(count(if(timestampdiff(second,u.start_time,u.end_time)>=v.duration,1,null))/count(u.video_id),3)
as avg_comp_play_rate
from tb_user_video_log u inner join tb_video_info v on u.video_id =v.video_id
where year(u.start_time)=2021
group by u.video_id
order by avg_comp_play_rate desc
