query: SELECT first_name ,   last_name ,   salary ,  department_id ,  MAX(salary) FROM employees GROUP BY department_id
question: display the department ID, full name (first and last name), salary for those there employees which is highest salary in every department.
query_toks: SELECT first_name , last_name , salary , department_id , MAX ( salary ) FROM employees GROUP BY department_id
query_toks_no_value: select first_name , last_name , salary , department_id , max ( salary ) from employees group by department_id
question_toks: display the department ID, full name (first and last name), salary for those there employees which is highest salary in every department.