select tag, concat ( round( avg( case when timestampdiff (second, start_time, end_time) < duration then timestampdiff (second, start_time, end_time) / duration else 1 end ) * 100, 2 ), '%' ) avg_play_progress from tb_user_video_log t, tb_video_info tb where t.video_id = tb.video_id group by tb.ta...