题解 | #各个视频的平均完播率#

select 
    a.video_id,
    round(
        avg(
            case when timestampdiff(second,start_time,end_time)>=duration then 1
                 else 0 end
        ),3
    ) as avg_comp_play_rate
from tb_user_video_log a
join tb_video_info b
    using(video_id)
where year(start_time)='2021'
group by video_id
order by avg_comp_play_rate desc