Department Highest Salary

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The Employee table holds all employees. Every employee has an Id, a salary, and there is also a column for the department Id.

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

The Department table holds all departments of the company.

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

Write a SQL query to find employees who have the highest salary in each of the departments. For the above tables, Max has the highest salary in the IT department and Henry has the highest salary in the Sales department.

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

大概意思是查询出每个部门薪水最高的人。

我的sql语句:

select d.Name as Department,c.Name as Employee,c.Salary from
(select a.Id,a.Name,a.Salary,a.DepartmentId from Employee a,
(select max(Salary) as Salary,DepartmentId from Employee group by DepartmentId)b 
where a.DepartmentId = b.DepartmentId and a.Salary = b.Salary) c,Department d
where c.DepartmentId = d.Id order by d.Id asc
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