This book is divided into two units, the first containing preparatory material for the Oracle9i Introduction to SQL exam part of the Oracle9i DBA certification track.The first unit has eight chapters, each containing several discussions that focus on a particular topic or subtopic objective listed by the Oracle Certified Professional Oracle9i DBA Track Candidate Guide for the Introduction to SQL exam. (For a complete listing of all the topics tested for this exam, check Chapter 1 .) These discussions are followed by a "For Review" section, each listing the three or four most important concepts for you to retain from the discussion. After the review, you'll see two to six exercise questions in exam-based multiple-choice or shortanswer format. Following the questions you will find an answer key for those questions, which should help you master the material even more quickly Thus, with this book you're never more than a few pages away from demonstrating what you've learned about Oracle SQL for the OCP exam.