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 u.video_id, round(SUM(CASE WHEN timestampdiff(second, u.start_time, u.end_time) >= v.duration THEN 1 ELSE 0 END) / count(*), 3) as avg_comp_play_rate from tb_user_video_log u join tb_video_info v using (video_id) where year(start_time) = 2021 group by video_id order by avg_comp_play_rate desc