/*Write a query to display the employee id, name ( first name and last name ) and the job id column with a modified title
 SALESMAN for those employees whose job title is ST_MAN and DEVELOPER for whose job title is IT_PROG.

*/

    SELECT  employee_id,  first_name, last_name,    
    CASE job_id    
    WHEN 'ST_MAN' THEN 'SALESMAN'    
    WHEN 'IT_PROG' THEN 'DEVELOPER'    
    ELSE job_id    
    END AS designation,  salary   
    FROM employees;  