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SQL: The Complete Reference
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can be embedded into another language, such as COBOL or C, to extend that language for use in database access. Alternatively, they can be explicitly sent to a database management system for processing, via a call-level interface from a language such as C, C++, or Java, or via messages sent over a computer network. Finally, SQL is not a particularly structured language, especially when compared to highly structured languages such as C, Pascal, or Java. Instead, SQL statements resemble English sentences, complete with noise words that don t add to the meaning of the statement but make it read more naturally. There are quite a few inconsistencies in the SQL language, and there are also some special rules to prevent you from constructing SQL statements that look perfectly legal, but don t make sense. Despite the inaccuracy of its name, SQL has emerged as the standard language for using relational databases. SQL is both a powerful language and one that is relatively easy to learn. The quick tour of SQL in 2 will give you a good overview of the language and its capabilities.
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The Role of SQL
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SQL is not itself a database management system, nor is it a stand-alone product. You cannot go into a computer store and buy SQL. Instead, SQL is an integral part of a database management system, a language and a tool for communicating with the DBMS. Figure 1-2 shows some of the components of a typical DBMS, and how SQL acts as the glue that links them together. The database engine is the heart of the DBMS, responsible for actually structuring, storing, and retrieving the data in the database. It accepts SQL requests from other DBMS components such as a forms facility, report writer, or interactive query facility from user-written application programs, and even from other computer systems. As the figure shows, SQL plays many different roles: I SQL is an interactive query language. Users type SQL commands into an interactive SQL program to retrieve data and display it on the screen, providing a convenient, easy-to-use tool for ad hoc database queries. I SQL is a database programming language. Programmers embed SQL commands into their application programs to access the data in a database. Both userwritten programs and database utility programs (such as report writers and data entry tools) use this technique for database access. I SQL is a database administration language. The database administrator responsible for managing a minicomputer or mainframe database uses SQL to define the database structure and control access to the stored data. I SQL is a client/server language. Personal computer programs use SQL to communicate over a network with database servers that store shared data. This client/server architecture has become very popular for enterprise-class applications.
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I SQL is an Internet data access language. Internet web servers that interact with corporate data and Internet applications servers all use SQL as a standard language for accessing corporate databases. I SQL is a distributed database language. Distributed database management systems use SQL to help distribute data across many connected computer systems. The DBMS software on each system uses SQL to communicate with the other systems, sending requests for data access. I SQL is a database gateway language. In a computer network with a mix of different DBMS products, SQL is often used in a gateway that allows one brand of DBMS to communicate with another brand. SQL has thus emerged as a useful, powerful tool for linking people, computer programs, and computer systems to the data stored in a relational database.
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AN OVERVIEW OF SQL
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Figure 1-2.
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Components of a typical database management system
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SQL: The Complete Reference
SQL Features and Benefits
SQL is both an easy-to-understand language and a comprehensive tool for managing data. Here are some of the major features of SQL and the market forces that have made it successful: I Vendor independence I Portability across computer systems I SQL standards I IBM endorsement and commitment (DB2) I Microsoft commitment (SQL Server, ODBC, and ADO) I Relational foundation I High-level, English-like structure I Interactive, ad hoc queries I Programmatic database access I Multiple views of data I Complete database language I Dynamic data definition I Client/server architecture I Enterprise application support I Extensibility and object technology I Internet database access I Java integration (JDBC) I Industry infrastructure These are the reasons why SQL has emerged as the standard tool for managing data on personal computers, minicomputers, and mainframes. They are described in the sections that follow.
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