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SQL: The Complete Reference
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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
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The SQL Language
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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.
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AN OVERVIEW OF SQL
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Figure 1-1.
Using SQL for database access
The name 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: I Data definition. SQL lets a user define the structure and organization of the stored data and relationships among the stored data items. I Data retrieval. SQL allows a user or an application program to retrieve stored data from the database and use it. I Data manipulation. SQL allows a user or an application program to update the database by adding new data, removing old data, and modifying previously stored data. I Access control. SQL can be used to restrict a user s ability to retrieve, add, and modify data, protecting stored data against unauthorized access. I Data sharing. SQL is used to coordinate data sharing by concurrent users, ensuring that they do not interfere with one another. I Data integrity. SQL defines integrity constraints in the database, protecting it from corruption due to inconsistent updates or system failures. SQL is thus a comprehensive language for controlling and interacting with a database management system. Second, SQL is not really a complete computer language like COBOL, C, C++, or Java. SQL contains no IF statement for testing conditions, and no GOTO, DO, or FOR statements for program flow control. Instead, SQL is a database sublanguage, consisting of about 40 statements specialized for database management tasks. These SQL statements
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