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Introduction
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his book is a translation and enhancement of the third edition of a book I wrote about SQL in Dutch. The first edition was published in February 1993, the second edition in April 1998, and I finished the third edition to reflect Oracle Database 10g in the summer of 2004. I always thought that there were more than enough books in English about the SQL language out there already, but finally, some good friends convinced me to publish an English version of my book. I hate thick books. I start reading them, put them aside on a certain pile on my desk, from where they are purged every now and then (if the pile becomes too high), without being read to the end. Therefore, in my own book, I have tried to be as concise as possible.
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About This Book
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This is not a book about advanced SQL. It is not a book about the Oracle optimizer and diagnostic tools. And it is not a book about relational calculus, predicate logic, or set theory. This book is a SQL primer. It is meant to help you learn Oracle SQL by yourself. It is ideal for self-study, but it can also be used as a guide for SQL workshops and instructor-led classroom training. This is a practical book; therefore, you need access to an Oracle environment for handson exercises. All the software that you need to install Oracle Database 10g on Microsoft Windows and to create an Oracle database is available from the CD-ROM included with this book. This book is based on the following Oracle release: Oracle Database 10g for Windows (or Red Hat Linux) Release 10.1.0.x Although this book assumes an Oracle Database 10g environment, you can also use it with Oracle9i or even with Oracle8i. However, Oracle is adding new SQL syntax with every new release; therefore, some SQL syntax examples could fail when issued against these earlier releases. You can check this yourself by querying the online Oracle documentation. Oracle SQL Reference offers a section titled Oracle Database 10g New Features in the SQL Reference at the end of the introduction, preceding 1. I follow the ANSI/ISO standard (SQL:2003) as much as possible. Only in cases of useful Oracle-specific SQL extensions do I deviate from this international standard. Therefore, most SQL examples given in this book are probably also valid for other database management system (DBMS) implementations supporting the SQL language. By the way, Oracle SQL Reference contains an Appendix B, Oracle and Standard SQL, discussing the differences between the ANSI/ISO SQL standard and the Oracle SQL implementation.
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INTRODUCTION
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The SQL and SQL*Plus commands are explained with concrete examples. The examples are presented clearly in a listing format, as in the example shown here. Listing I-1. A SQL SELECT Command SQL> select 'Hello world!' 2 from dual; I focus on the main points, avoiding peripheral issues and technical details as much as possible. This book does not intend (nor pretend) to be complete; the SQL language is too voluminous and the Oracle environment is much too complex. Oracle SQL Reference contains about 1,800 pages these days, and even Oracle SQL Quick Reference is not really a small document, with its 170 pages. Moreover, the current ANSI/ISO SQL standard documentation has grown to a size that simply is not printable anymore. The main objective of this book is the combination of usability and affordability. The official Oracle documentation offers detailed information in case you need it. Therefore, it is a good idea to have the Oracle manuals available while working through the examples and exercises in this book. The Oracle documentation is available online on the Oracle Technology Network (http://www.oracle.com/technology/documentation) and can be downloaded from there (if you don t want to keep an Internet connection open all the time). The focus of this book is using SQL for data retrieval. Data definition and data manipulation are covered in less detail. Security, authorization, and database administration are mentioned only for the sake of completeness in the SQL overview section in 2. Throughout the book, we use a case consisting of seven tables. These seven tables contain information about employees, departments, and courses. As Chris Date, a well-known guru in the professional database world (see Appendix E for references to some of the great books he wrote), said during one of his seminars, There are only three databases: employees and departments, orders and line items, and suppliers and shipments. The cardinality of the case tables is deliberately kept low. This enables you to check the results of your SQL commands manually, which is nice while you re learning to master the SQL language. In general, checking your results manually is impossible in real information systems, due to the volume of data in such systems. It is not the data volume or query response time that matters in this book. What s important is the database structure complexity and SQL statement correctness. By the way, the two case tables EMPLOYEES and DEPARTMENTS show a striking resemblance to good old SCOTT.EMP and SCOTT.DEPT, two of the Oracle demo tables that have been shipped with Oracle pretty much from the very beginning.
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