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

***

> /*highest salary by each dept*/

***
select d.Dept_Name,max(e.salary)
    from emp_details as e join Dept_Details as d
    on e.d_id=d.Dept_Id
    group by  d.Dept_Name

select  distinct e.d_id,d.Dept_Name
    from emp_details as e join Dept_Details as d 
    on e.d_id=d.Dept_Id

select  e.salary,d.Dept_Name,d.Dept_Id
    from emp_details as e join Dept_Details as d 
    on e.d_id=d.Dept_Id

/////simplest query for max salary dept_wise////