Warning: include() [function.include]: URL file-access is disabled in the server configuration in /home/softwa19/public_html/dictionary/D/data+model.html on line 67
Warning: include(http://www.softwaredealz.com/software/468ad.html) [function.include]: failed to open stream: no suitable wrapper could be found in /home/softwa19/public_html/dictionary/D/data+model.html on line 67
Warning: include() [function.include]: Failed opening 'http://www.softwaredealz.com/software/468ad.html' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php:/usr/local/php4') in /home/softwa19/public_html/dictionary/D/data+model.html on line 67
data model
<database> The product of the 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 entity-relationship model. The relational model is
the most widely used type of data model. Another example is
NIAM.
["Principles of Database and Knowledge-Base Systems",
J.D. Ullman, Volume I, Computer Science Press, 1988, p. 32].
(2000-06-24)
Try this search on OneLook / Google
Nearby terms:
data mart « Datamation « data mining « data model » data modeling » data modelling » Data Over Cable Service Interface Specification
This article was derived from the Free Online Dictionary of Computers and is available under ther terms of the GNU Free Documentation License.
Warning: include() [function.include]: URL file-access is disabled in the server configuration in /home/softwa19/public_html/dictionary/D/data+model.html on line 139
Warning: include(http://www.softwaredealz.com/software/bigbottom.html) [function.include]: failed to open stream: no suitable wrapper could be found in /home/softwa19/public_html/dictionary/D/data+model.html on line 139
Warning: include() [function.include]: Failed opening 'http://www.softwaredealz.com/software/bigbottom.html' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php:/usr/local/php4') in /home/softwa19/public_html/dictionary/D/data+model.html on line 139
| 