题解 | 各个视频的平均完播率

select 
    tb_user_video_log.video_id, 
    round(count(if(timestampdiff(SECOND,start_time, end_time)>=duration,1,NULL))/count(1),3)
    as avg_comp_play_rate
from tb_user_video_log 
inner join tb_video_info
on tb_video_info.video_id = tb_user_video_log.video_id
where year(start_time)=2021

group by video_id
order by avg_comp_play_rate desc