题解 | #各个视频的平均完播率#

SELECT a.video_id, 
ROUND(SUM(CASE WHEN TIMESTAMPDIFF(SECOND, a.start_time, a.end_time) >= b.duration THEN 1 ELSE 0 END)/COUNT(a.uid),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(a.start_time) = '2021'
GROUP BY a.video_id
ORDER BY avg_comp_play_rate desc