题解 | #平均播放进度大于60%的视频类别#
平均播放进度大于60%的视频类别
https://www.nowcoder.com/practice/c60242566ad94bc29959de0cdc6d95ef
SELECT tag, CONCAT(ROUND(AVG(IF(TIMESTAMPDIFF(SECOND, start_time, end_time) > duration, 100, TIMESTAMPDIFF(SECOND, start_time, end_time)/duration*100)),2),'%') AS avg_play_progress FROM tb_user_video_log LEFT JOIN tb_video_info USING(video_id) GROUP BY tag HAVING AVG(IF(TIMESTAMPDIFF(SECOND, start_time, end_time) > duration, 100, TIMESTAMPDIFF(SECOND, start_time, end_time)/duration*100)) > 60 ORDER BY avg_play_progress DESC;
百分比真的好麻烦啊，
第一行如果把avg放在最外面，则结果小数无论怎么改都是三位小数 而且没有百分号。
倒数第二行如果直接用 avg_play_progress 结果会有三个···
