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 DeptID, MAX(Salary)
 FROM EmpDetails
GROUP BY DeptID

This query will work fine, but the moment if you want to fetch some others details related to the employee having the highest salary will contradict. You can use :

SELECT DepatID, a , b, c
 FROM EmpDetails
 WHERE Salary IN (
    SELECT max(Salary)
      FROM EmpDetails
     GROUP BY DeptID
 );

if you will use the previous query it will only reflects the records of the min val except the salary as you have used the max function.