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