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 * from (
    select a.* from EmpDetails a 
    right join (select DeptID,max(salary) as Salary from EmpDetails group by DeptID) b
    on b.DeptID=a.DeptID and b.salary=a.salary ) as c  group by c.DeptID;