Query Check responsibility assigned to a specific USER

SELECT UNIQUE u.user_id, SUBSTR (u.user_name, 1, 30) user_name,
              SUBSTR (r.responsibility_name, 1, 60) responsiblity,
              SUBSTR (a.application_name, 1, 50) application
         FROM fnd_user u,
              fnd_user_resp_groups g,
              fnd_application_tl a,
              fnd_responsibility_tl r
        WHERE g.user_id(+) = u.user_id
          AND g.responsibility_application_id = a.application_id
          AND a.application_id = r.application_id
          AND g.responsibility_id = r.responsibility_id
          AND a.application_name = 'Purchasing'
     ORDER BY SUBSTR (user_name, 1, 30),
              SUBSTR (a.application_name, 1, 50),
              SUBSTR (r.responsibility_name, 1, 60)