SQL Puzzle: Top and Bottom Salaries

Determine, from the provided employee data, which employees have the highest and lowest salaries within each department.

Input Data:

Expected Output:

Data Script:

CREATE TABLE EmployeeInfo
(
	EmployeeID INT,
	EmpName NVARCHAR(250) NULL,
	EmpSalary DECIMAL(36,4) NULL,
	EmpDepartment NVARCHAR(75) NULL
)
INSERT INTO EmployeeInfo VALUES
	(100,'Jhon',45000,'HR'),
	(101,'Alex',50000,'HR'),
	(102,'Kim',5000,'HR'),
	(103,'Sas',50000,'HR'),
	(104,'Chari',100000,'Sales'),
	(105,'Vasu',86000,'Sales'),
	(106,'Sri',72000,'Sales'),
	(107,'Mahesh',8915,'Sales'),
	(108,'Asad',1200,'Marketing'),
	(109,'Ghani',1250,'Marketing'),
	(110,'KingS',10000,'Marketing'),
	(111,'Pushpa',50000,'Marketing')

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;WITH CTE AS
(
	SELECT EmpDepartment,
	MIN(EmpSalary) MinSalary,
	MAX(EmpSalary) MaxSalary
	FROM EmployeeInfo
	GROUP BY EmpDepartment
)

SELECT EMP.* FROM EmployeeInfo EMP
INNER JOIN CTE 
	ON EMP.EmpDepartment = CTE.EmpDepartment
	AND EMP.EmpSalary = CTE.MinSalary
UNION ALL
SELECT EMP.* FROM EmployeeInfo EMP
INNER JOIN CTE 
	ON EMP.EmpDepartment = CTE.EmpDepartment
	AND EMP.EmpSalary = CTE.MaxSalary
ORDER BY EMP.EmpDepartment