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 | Henry | 80000 | 2 | | 3 | Sam | 60000 | 2 | | 4 | 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。例如,根据上述给定的表格,Max 在 IT 部门有最高工资,Henry 在 Sales 部门有最高工资。
+------------+----------+--------+ | Department | Employee | Salary | +------------+----------+--------+ | IT | Max | 90000 | | Sales | Henry | 80000 | +------------+----------+--------+
例1:
# Write your MySQL query statement below select d.Name as Department,e.Name as Employee,e.Salary from Department d,Employee e where e.DepartmentId=d.Id and e.Salary=(Select max(Salary) from Employee where DepartmentId=d.Id)
例2:
# Write your MySQL query statement below select d.Name as Department,e.Name as Employee,Salary from Employee e join Department d on e.DepartmentId=d.Id where (e.Salary,e.DepartmentId) in (select max(Salary),DepartmentId from Employee group by DepartmentId)