题解 | #各个视频的平均完播率#
各个视频的平均完播率
https://www.nowcoder.com/practice/96263162f69a48df9d84a93c71045753
select b.video_id as video_id, round(sum(if(TIMESTAMPDIFF(SECOND,a.start_time,a.end_time)>=b.duration,1,0))/count(a.video_id),3) as avg_comp_play_rate from tb_user_video_log a left join tb_video_info b using(video_id) where year(start_time)=2021 group by a.video_id order by avg_comp_play_rate desc
timrstampdiff(时间类型，起，止）
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