you can just google it, plenty of stuff out there like...
Code:
SELECT b.responsibility_name NAME
FROM apps.fnd_user_resp_groups a,
apps.fnd_responsibility_vl b,
apps.fnd_user u
WHERE a.user_id = u.user_id
AND u.user_id = &p_user_id
AND a.responsibility_id = b.responsibility_id
AND a.responsibility_application_id = b.application_id
AND SYSDATE BETWEEN a.start_date AND NVL (a.end_date, SYSDATE + 1)
AND b.end_date IS NULL
AND u.end_date IS NULL
... which retrieves responsibilities for a specific user.