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1

Acknowledgments Introduction CHAPTER 1 Relational Database Concepts What Is a Database What Is a Database Management System (DBMS) What Is a Relational Database Relational Database Components How Relational Databases Are Designed The Need for Normalization Applying the Normalization Process Overview of the Video Store Sample Database Downloading the SQL for the Sample Database Quiz SQL Concepts What Is SQL Connecting to the Database A Brief History of SQL SQL Syntax Conventions SQL Statement Categories Data De nition Language (DDL) Data Query Language (DQL) Data Manipulation Language (DML)

1

he SQL language and relational database systems based on it are one of the most important foundation technologies in the computer industry Over the last two decades, SQL has grown from its first commercial use into a computer product and services market segment worth tens of billions of dollars per year, and SQL stands today as the standard computer database language Literally hundreds of database products now support SQL, running on computer systems from mainframes to personal computers and even handheld devices An official international SQL standard has been adopted and expanded twice Virtually every major enterprise software product relies on SQL for its data management, and SQL is at the core of the database products from Microsoft, Oracle, and IBM, the three largest software companies in the world.

SQL is also at the heart of open-source database products that are helping to fuel the popularity of Linux and the open-source movement From its obscure beginnings as an IBM research project, SQL has leaped to prominence as both an important computer technology and a powerful market force.

What, exactly, is SQL Why is it important What can it do, and how does it work If SQL is really a standard, why are there so many different versions and dialects How do popular SQL products like SQL Server, Oracle, Informix, Sybase, and DB2 compare How does SQL relate to Microsoft standards, such as ODBC and COM How does JDBC link SQL to the world of Java and object technology What role does it play in the emerging web services architecture, and the competing web services architectures from the Microsoft and Java-based camps Does SQL really scale from mainframes to handheld devices Has it really delivered the performance needed for high-volume transaction processing How will SQL impact the way you use computers, and how can you get the most out of this important data management tool.

48 48 48 53 54 54 55 60 69 70 70 70 76 77 78 80 81 87 88 90 90 94 94 97 100 108 110 110 115 116 117 119

SQL is a tool for organizing, managing, and retrieving data stored by a computer database. The acronym SQL is an abbreviation for Structured Query Language. For historical reasons, SQL is usually pronounced sequel, but the alternate pronunciation S.Q.L. is also used. As the name implies, SQL is a computer language that you use to interact with a database. In fact, SQL works with one specific type of database, called a relational database. Figure 1-1 shows how SQL works. The computer system in the figure has a database that stores important information. If the computer system is in a business, the database might store inventory, production, sales, or payroll data. On a personal computer, the database might store data about the checks you have written, lists of people and their phone numbers, or data extracted from a larger computer system. The computer program that controls the database is called a database management system, or DBMS. When you need to retrieve data from a database, you use the SQL language to make the request. The DBMS processes the SQL request, retrieves the requested data, and returns it to you. This process of requesting data from a database and receiving back the results is called a database query hence the name Structured Query Language.

1:

Figure 1-1.