184. Department Highest Salary - 部门工资最高的员工 ＜Medium＞

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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。

 

select b.Name as `Department`,a.Name as `Employee`,a.Salary
from Employee a 
left join Department b on b.Id = a.DepartmentId
where a.Salary in (select max(Salary) from Employee where DepartmentId = b.Id
)or select b.name as `Department`,a.Name as `Employee`,a.Salary 
from Employee a, Department b 
where b.Id = a.DepartmentId and a.Salary in (select max(Salary) from Employee where DepartmentId = b.Id
)

 

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