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, pv, rk from(
select cid,
max(release_date) as release_date,
round(count(*)*1.0,3) as pv,
row_number() over (order by count(*) desc, max(release_date) desc) as rk
from play_record_tb
left join course_info_tb
using(cid)
group by cid, uid
having count(*) >1
) t
where rk < 4
order by rk
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