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data model


e> The product of the ef="module.php?name=Lexikon&file=search&eid=1&query=database">database design process which aims to identify and organize the required data logically and physically. A data model says what information is to be contained in a database, how the information will be used, and how the items in the database will be related to each other. For example, a data model might specify that a customer is represented by a customer name and credit card number and a product as a product code and price, and that there is a one-to-many relation between a customer and a product. It can be difficult to change a database layout once code has been written and data inserted. A well thought-out data model reduces the need for such changes. Data modelling enhances application maintainability and future systems may re-use parts of existing models, which should lower development costs. A data modelling language is a mathematical formalism with a notation for describing data structures and a set of operations used to manipulate and validate that data. One of the most widely used methods for developing data models is the ef="module.php?name=Lexikon&file=search&eid=1&query=entity-relationship model">entity-relationship model. The ef="module.php?name=Lexikon&file=search&eid=1&query=relational model">relational model is the most widely used type of data model. Another example is ef="module.php?name=Lexikon&file=search&eid=1&query=NIAM">NIAM. ["Principles of Database and Knowledge-Base Systems", J.D. Ullman, Volume I, Computer Science Press, 1988, p. 32]. (2000-06-24)

e="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents:
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