文章目錄

• • 1. 題目
  • 2. 解題

1. 題目

Employee 表包含所有員工信息，每個員工有其對應的工號 Id，姓名 Name，工資 Salary 和部門編號 DepartmentId 。

+----+-------+--------+--------------+ | Id | Name | Salary | DepartmentId | +----+-------+--------+--------------+ | 1 | Joe | 85000 | 1 | | 2 | Henry | 80000 | 2 | | 3 | Sam | 60000 | 2 | | 4 | Max | 90000 | 1 | | 5 | Janet | 69000 | 1 | | 6 | Randy | 85000 | 1 | | 7 | Will | 70000 | 1 | +----+-------+--------+--------------+

Department 表包含公司所有部門的信息。

+----+----------+ | Id | Name | +----+----------+ | 1 | IT | | 2 | Sales | +----+----------+

編寫一個 SQL 查詢，找出每個部門獲得前三高工資的所有員工。

例如，根據上述給定的表，查詢結果應返回：

+------------+----------+--------+ | Department | Employee | Salary | +------------+----------+--------+ | IT | Max | 90000 | | IT | Randy | 85000 | | IT | Joe | 85000 | | IT | Will | 70000 | | Sales | Henry | 80000 | | Sales | Sam | 60000 | +------------+----------+--------+ 解釋：IT 部門中， Max 獲得了最高的工資， Randy 和 Joe 都拿到了第二高的工資， Will 的工資排第三。銷售部門（Sales）只有兩名員工， Henry 的工資最高，Sam 的工資排第二。

來源：力扣（LeetCode）
鏈接：https://leetcode-cn.com/problems/department-top-three-salaries
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2. 解題

# Write your MySQL query statement below select Department, Employee, Salary from (select d.Name Department, e.Name Employee, Salary,dense_rank() over(partition by d.Name order by Salary desc) rnkfrom Employee e left join Department don e.DepartmentId = d.Id ) t where rnk <= 3 and Department is not null

or

# Write your MySQL query statement below select Department, Employee, Salary from (select d.Name Department, e.Name Employee, Salary,dense_rank() over(partition by d.Name order by Salary desc) rnkfrom Employee e right join Department don e.DepartmentId = d.Id ) t where rnk <= 3 and Employee is not null

or 使用內連接，自動去除 null 的行

select Department, Employee, Salary from (select d.Name Department, e.Name Employee, Salary,dense_rank() over(partition by d.Name order by Salary desc) rnkfrom Employee e join Department don e.DepartmentId = d.Id ) t where rnk <= 3

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