题解 | 每类视频近一个月的转发量/率
每类视频近一个月的转发量/率
https://www.nowcoder.com/practice/a78cf92c11e0421abf93762d25c3bfad
select tag,sum(if_retweet) retweet_cnt,round(sum(if_retweet)/count(*),3) retweet_rate from tb_user_video_log tl left join tb_video_info ti on tl.video_id = ti.video_id where timestampdiff(day,start_time,(select max(start_time) from tb_user_video_log))<=29 group by tag order by retweet_rate desc