SELECT first_name ,   last_name ,   salary ,  department_id ,  MAX(salary) FROM employees GROUP BY department_id
display the department ID, full name (first and last name), salary for those employees who is highest salary in every department.
SELECT first_name , last_name , salary , department_id , MAX ( salary ) FROM employees GROUP BY department_id
select first_name , last_name , salary , department_id , max ( salary ) from employees group by department_id
display the department ID , full name ( first and last name ) , salary for those employees who is highest salary in every department .