题解 | 被重复观看次数最多的3个视频
被重复观看次数最多的3个视频
https://www.nowcoder.com/practice/b75fa2412659422c96369976ee1f9504
select cid,cast(pv as decimal(10,3)), row_number()over(order by pv desc,release_date desc) rk from (select uid,cid, count(*) pv from play_record_tb group by uid,cid having count(*)>1) t join course_info_tb c using(cid) limit 3; 题目最后输出要求转换成浮点格式；每人只观看一次的视频要最早就筛选掉，不参加排名；最后限制3条数据用limit即可
