Highest Salary in each department

Question

I have a table EmpDetails:

DeptID      EmpName   Salary
Engg        Sam       1000
Engg        Smith     2000
HR          Denis     1500
HR                  


        

Answer 1

WITH cteRowNum AS (
    SELECT DeptID, EmpName, Salary,
           ROW_NUMBER() OVER(PARTITION BY DeptID ORDER BY Salary DESC) AS RowNum
        FROM EmpDetails
)
SELECT DeptID, EmpName, Salary,Rownum
    FROM cteRowNum
    WHERE RowNum in(1,2);