部门工资最高的员工

184. 部门工资最高的员工

难度中等358

SQL架构

Employee 表包含所有员工信息，每个员工有其对应的 Id, salary 和 department Id。

+----+-------+--------+--------------+
| Id | Name  | Salary | DepartmentId |
+----+-------+--------+--------------+
| 1  | Joe   | 70000  | 1            |
| 2  | Jim   | 90000  | 1            |
| 3  | Henry | 80000  | 2            |
| 4  | Sam   | 60000  | 2            |
| 5  | Max   | 90000  | 1            |
+----+-------+--------+--------------+

Department 表包含公司所有部门的信息。

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

编写一个 SQL 查询，找出每个部门工资最高的员工。对于上述表，您的 SQL 查询应返回以下行（行的顺序无关紧要）。

+------------+----------+--------+
| Department | Employee | Salary |
+------------+----------+--------+
| IT         | Max      | 90000  |
| IT         | Jim      | 90000  |
| Sales      | Henry    | 80000  |
+------------+----------+--------+

解释：

Max 和 Jim 在 IT 部门的工资都是最高的，Henry 在销售部的工资最高。

in 关键字可以用于元组

select 
d.Name as Department, e.name as Employee, e.Salary as Salary 
from 
Employee e,Department d
where e.DepartmentId = d.id
and (Salary,DepartmentId) in
(
    select max(Salary) ,DepartmentId
    from 
    Employee
    group by DepartmentId
)

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