LeetCode（数据库）- 项目员工 II

Posted 2021-08-14 Lux_Sun

题目链接：点击打开链接

题目大意：略。

解题思路：注意解决方案(1)使用的 ALL 函数。

AC 代码

-- 解决方案(1)
select project_id
from project
group by project_id
having count(*) >=all 
(select count(*) amount
from project 
group by project_id)

-- 解决方案(2)
SELECT project_id
FROM (SELECT project_id, dense_RANK() OVER(ORDER BY COUNT(*) DESC) CNT
FROM Project
GROUP BY project_id) RS
WHERE CNT = 1