题解 | sql156#各个视频的平均完播率#

select 
  a.video_id,
  round(sum(if(end_time - start_time >= duration, 1,0)) / count(start_time),3) as avg_comp_play_rate
from tb_user_video_log as a
left join tb_video_info as b
on a.video_id = b.video_id
where year(start_time) = 2021
group by a.video_id
order by avg_comp_play_rate DESC