题解 | #各个视频的平均完播率#

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