http://education.oracle.com/pls/web_prod-plq-dad/db_pages.getpage?page_id=458&p_org_id=70&lang=JA&get_params=p_track_id:Datab11g
1Z0-051:
http://www.choudhari.net/downloads/Certifications/11g/1Z0-051/Oracle%2011g-%20SQL%20Fundamental%20Exam%20Guide%20%28Exam%201Z0-051%29.pdf