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Introduction A collection of programs that enables you to store modify and extract information from a database There are many different types of DBMSs ranging from small systems that run on personal computers to huge systems that run on mainframes The following are examples of database applications Computerized library systems Automated teller machines Flight reservation systems computerized parts inventory systems From a technical standpoint DBMSs can differ widely The terms relational network flat and hierarchical all refer to the way a DBMS organizes information internally The internal organization can affect how quickly and flexibly you can extract information Requests for information from a database are made in the form of a query which is a stylized question For example the query SELECT ALL WHERE NAME SMITH AND AGE gt 35 requests all records in which the NAME field is SMITH and the AGE field is greater than 35 The set of rules for constructing queries is known as a query language Different DBMSs support different query languages although there is a semi-standardized query language called SQL structured query language Sophisticated languages for managing database systems are called fourth-generation languages or 4GLs for short The information from a database can be presented in a variety of formats Most DBMSs include a report writer program that enables you to output data in the form of a report Many DBMSs also include a graphics component that enables you to output information in the form of graphs and charts Whats wrong with a file system and also whats right The file system that comes with your computer is a very primitive kind of database management system Whether your computer came with the Unix file system NTFS or the Macintosh file system the basic idea is the same Data are kept in big unstructured named clumps called files The great thing about the file system is its
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