OCA Oracle Database SQL Certified Expert Exam Guide (Exam 1Z0-047) (Oracle Press)
Steve O'Hearnhas been an Oracle Certified Application Developer since 1999. He has designed databases for 23 years for clients such as the U.S. Army, U.S. Navy, the FAA, the World Bank, NASA, and others. He has served as a Chief Technology Officer, a consultant, and Instructor, and is the author of several computer books, including the "Oracle OCP Developer PL/SQL Program Units Exam Guide," from Oracle Press.