题解 | #平均播放进度大于60%的视频类别#

SELECT DISTINCT
tag,
CONCAT(ROUND(total/tag_video_num * 100, 2), '%') AS avg_play_progress

    FROM(
    SELECT
    tag,
    SUM(IF((TIME_TO_SEC(end_time) - TIME_TO_SEC(start_time))/duration > 1, 1, (TIME_TO_SEC(end_time)     - TIME_TO_SEC(start_time))/duration))OVER(PARTITION BY tag) AS total,
    COUNT(*) OVER(PARTITION BY tag) AS tag_video_num

    FROM 
    tb_user_video_log AS u
    INNER JOIN
    tb_video_info AS v
        USING(video_id)) AS a
    
WHERE total/tag_video_num * 100 > 60

ORDER BY avg_play_progress DESC