/*4. Write a query in SQL to display the first name, last name, department number and department name, for all employees for
 departments 80 or 40. */
SELECT E.first_name , E.last_name ,   
       E.department_id ,  D.department_name   
         FROM employees E   
         JOIN departments D   
          ON E.department_id = D.department_id   
          AND E.department_id IN (80 , 40)  
           ORDER BY E.last_name;