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

SELECT Employee_ID
     , First_name
     , last_name
     , department_id
     , Salary 
FROM (SELECT Employee_ID
           , First_name
           , last_name
           , department_id
           , Salary
           , MAX(salary) OVER (PARTITION BY department_id) dept_max_sal
      FROM EMPLOYEES) AS Emp
WHERE salary = dept_max_sal;