题解 | #平均播放进度大于60%的视频类别#

with t1 as (
select video_id,tag,
case when timestampdiff(second,start_time,end_time)<duration then timestampdiff(second,start_time,end_time)/duration*100
else 1*100 end
as play_progress
from tb_video_info
join tb_user_video_log using(video_id)
)
select tag, concat(round(avg(play_progress),2),'%') as avg_play_progress
from  t1
group by tag
having round(avg(play_progress),2) > 60
order by  avg_play_progress desc

关键在于case when 语句 如果不设置条件 就会出现播放率大于100%的情况