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