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Introduction
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he SQL language and relational database systems based on it constitute one of the most important foundation technologies in the computer industry. Over the last three 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. Hundreds of database products now support SQL, running on computer systems from mainframes to personal computers. A SQL-based database may even be embedded in your mobile phone or PDA, or in the entertainment system of your car. An official international SQL standard has been adopted and expanded several times. Every major enterprise software product relies on SQL for its data management, and SQL is at the core of the flagship database products from Microsoft, Oracle, and IBM, three of the largest software companies in the world. SQL is also at the heart of open-source database products such as MySQL and Postgres 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 grown to become both an important piece of information 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 do we have so many different versions and dialects How do popular SQL products like SQL Server, Oracle, MySQL, Sybase, and DB2 compare How does SQL relate to Microsoft standards such as ODBC and .NET How does JDBC link SQL to the world of Java and object technology What role does it play in the Service-Oriented Architecture (SOA) and web services being embraced by enterprise IT organizations 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 This book answers those questions by giving you a complete perspective and a solid working knowledge of SQL.
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SQL is a tool for organizing, managing, and retrieving data stored by a computer database. The original name given it by IBM was Structured English Query Language, shortened to the acronym SEQUEL. When IBM discovered that SEQUEL was a trademark owned by the Hawker Siddeley Aircraft Company of the United Kingdom, they shortened the acronym to SQL. The word English was then dropped from the spelled-out name to match the new acronym. To this day, you will hear the acronym SQL pronounced as either a word ( sequel ) or as a string of letters ( S-Q-L ), and while the latter is generally preferred, both are considered correct. 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, which has become the mainstream way to organize data across a very broad range of computer applications. 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 (DBMS). When you need to retrieve data from a database, you use the SQL 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 the results is called a database query hence the name Structured Query Language. Structured Query Language is actually somewhat of a misnomer. First of all, SQL is far more than a query tool, although that was its original purpose, and retrieving data is still one of its most important functions. SQL is used to control all of the functions that a DBMS provides for its users, including
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