A relational database is a collection of information organized as a set of formally described tables from which data can be accessed or reassembled in many different ways without having to reorganize the database tables. A relational database management system (RDBMS) is a program that lets you create, update, and administer a relational database.
A RDBMS takes Structured Query Language (SQL) statements entered by a user or contained in an application and creates, updates, or provides access to the database. Some of the best-known management systems include Oracle's 9i, Microsoft's SQL Server 2000 and IBM's DB2. The majority of new enterprise-class databases are being created for use with these systems. But IBM has just priced its DB2 database management system in line with small business budgets.
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