SELECT JOB_TITLE_CODE1
FROM EMPLOYEES, INCUMBENTS, POSITIONS
WHERE FIRST_NAME="Bob"
              AND EMPLOYEES.SSN=INCUMBENTS.SSN
              AND INCUMBENTS.PCN=POSITIONS.PCN
              AND INCUMBENTS.START_DATE <= #01/01/1997#
              AND INCUMBENTS.END_DATE >#01/01/1997#;
