题解 | #各个视频的平均完播率#

select a.video_id,
round(sum(case when timestampdiff(second,start_time,end_time)>=b.duration then 1 else 0 end)/count(start_time),3) as rate
from tb_user_video_log a 
left join tb_video_info b on a.video_id=b.video_id
where year(start_time)=2021
group by video_id
order by rate desc