Book Image

OCA Oracle Database 11g: SQL Fundamentals I: A Real World Certification Guide ( 1ZO-051 )

By : Steve Ries
Book Image

OCA Oracle Database 11g: SQL Fundamentals I: A Real World Certification Guide ( 1ZO-051 )

By: Steve Ries

Overview of this book

<p>The Oracle Database 11g: SQL Fundamentals I exam is the first stepping stone in getting the Oracle Certified Associate Certification for Oracle Database 11g. The SQL programming language is used in every major relational database today and understanding the real world application of it is the key to becoming a successful DBA.<br /><br />This book gives you: the essential real world skills to master relational data manipulation with Oracle SQL and prepares you to become an Oracle Certified Associate. Beginners are introduced to concepts in a logical manner while practitioners can use it as a reference to jump to relevant concepts directly.<br /><br />We begin with the essentials of why databases are important in today's information technology world and how they work.<br /><br />We continue by explaining the concepts of querying and modifying data in Oracle using a range of techniques, including data projection, selection, creation, joins, sub-queries and functions. Finally, we learn to create and manipulate database objects and to use them in the same way as today's expert SQL programmers.<br /><br />This book prepares you to master the fundamentals of the SQL programming language using an example-driven method that is easy to understand<br /><br />This definitive certification guide provides a disciplined approach to be adopted for successfully clearing the 1Z0-051 SQL Fundamentals I exam, which is the first stepping stone towards attaining the OCA on Oracle Database 11g certification.<br /><br />Each chapter contains ample practice questions at the end. A full-blown mock test is included for practice so you can test your knowledge and get a feel for the actual exam.</p>
Table of Contents (20 chapters)
OCA Oracle Database 11g: SQL Fundamentals I: A Real-World Certification Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Using database constraints


Throughout this book, we have continually noted that what makes a relational database different are the relationships formed between its tables. In Chapter 1, SQL and Relational Databases, we discussed the entity relationship diagrams that visually display these relationships. We noted that in a relational model, tables may have a one-to-one or one-to-many relationship. For instance, in our Companylink data model, each employee can have one or more addresses listed in the address table. But, what would happen if we accidentally attempted to insert address information into the address table for an employee that didn't exist in the employee table? Up to this point in what we've learned, nothing is really stopping this from happening. However, doing so could have unforeseen consequences in subsequent queries. If the address table has rows that don't relate back to the employee table, then no relationship really exists between the two. There are other situations where...