select tag, concat(rate1,'%') as avg_play_progress from ( select tag, round(sum(if(timestampdiff(second,start_time,end_time)>=duration,duration,timestampdiff(second,start_time,end_time)))/sum(duration)*100,2) as rate1 from tb_user_video_log tu left join tb_video_info tv on tu.video_id = tv.video...