题解 | #各个视频的平均完播率#
各个视频的平均完播率
https://www.nowcoder.com/practice/96263162f69a48df9d84a93c71045753
select
tvl.video_id,
round(avg(if(timestampdiff(second,start_time,end_time)>=duration,1,0)),3)
//round(avg(case when timestampdiff(second,start_time,end_time)>= duration then 1 else 0 end),3)
avg_comp_play_rate
from tb_user_video_log tvl join tb_video_info tvi on tvl.video_id = tvi.video_id
where year(start_time) = 2021
group by tvl.video_id
order by avg_comp_play_rate desc
考点：
round()——小数点取数
timestampdiff（时间格式，start，end）——取间隔时间，并按照时间格式展示