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OCA Oracle Database 11g: SQL Fundamentals I Exam Guide (Exam 1Z0-051) by Roopesh Ramklass, John Watson

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INTRODUCTION
There is an ever-increasing demand for staff with IT industry certification. The benefits to employers are significant—they can be certain that staff have a certain level of competence—and the benefits to the individuals, in terms of demand for their services, are equally great. Many employers are now requiring technical staff to have certifications, and many IT purchasers will not buy from firms that do not have certified staff. The Oracle certifications are among the most sought after. But apart from rewards in a business sense, knowing that you are among a relatively small pool of elite Oracle professionals and that you have proved your competence is a personal reward well worth attaining.
There are several Oracle certification ...

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