继续TIMESTAMPDIFF
平均播放进度大于60%的视频类别
http://www.nowcoder.com/practice/c60242566ad94bc29959de0cdc6d95ef
select tag,
concat(round(avg(if(TIMESTAMPDIFF(second,start_time,end_time)>=duration,1,TIMESTAMPDIFF(second,start_time,end_time)/duration))*100,2)
,'%') as avg_play_progress
from tb_user_video_log join tb_video_info t1 using(video_id)
group by tag
having avg(if(TIMESTAMPDIFF(second,start_time,end_time)>=duration,1,TIMESTAMPDIFF(second,start_time,end_time)/duration))>0.6
order by avg_play_progress desc
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