data model
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) In addition suitable contents:
[ 2 ] [ = ] [ ag ] [ ai ] [ al ] [ AM ] [ am ] [ an ] [ app ] [ application ] [ ar ] [ arc ] [ as ] [ at ] [ B ] [ b ] [ ba ] [ base ] [ be ] [ bi ] [ by ] [ C ] [ ca ] [ card ] [ cat ] [ ch ] [ ci ] [ co ] [ code ] [ Computer ] [ con ] [ cr ] [ cu ] [ D ] [ data ] [ database ] [ data modelling ] [ data structure ] [ date ] [ de ] [ design ] [ development ] [ diff ] [ du ] [ ec ] [ ed ] [ edu ] [ ee ] [ entity-relationship model ] [ er ] [ era ] [ es ] [ et ] [ fi ] [ file ] [ fo ] [ for ] [ ga ] [ ge ] [ gh ] [ gi ] [ gn ] [ gu ] [ h ] [ hang ] [ hat ] [ hr ] [ ht ] [ IA ] [ IAM ] [ id ] [ ie ] [ iff ] [ il ] [ in ] [ inc ] [ int ] [ io ] [ ir ] [ is ] [ it ] [ J ] [ K ] [ la ] [ language ] [ ld ] [ Lex ] [ li ] [ logical ] [ ls ] [ lt ] [ lu ] [ ly ] [ M ] [ ma ] [ man ] [ method ] [ mo ] [ mod ] [ mode ] [ model ] [ modelling ] [ module ] [ mp ] [ ms ] [ N ] [ na ] [ nc ] [ ne ] [ nf ] [ ng ] [ ni ] [ NIAM ] [ no ] [ ns ] [ nu ] [ O ] [ om ] [ op ] [ org ] [ pa ] [ pe ] [ ph ] [ physical ] [ ping ] [ pl ] [ pm ] [ pr ] [ process ] [ product ] [ query ] [ rc ] [ re ] [ relation ] [ relational model ] [ ro ] [ ru ] [ S ] [ sa ] [ say ] [ sc ] [ se ] [ set ] [ sh ] [ si ] [ sig ] [ sm ] [ spec ] [ st ] [ struct ] [ su ] [ sy ] [ system ] [ T ] [ th ] [ to ] [ tr ] [ tt ] [ tw ] [ type ] [ ua ] [ ug ] [ um ] [ us ] [ V ] [ va ] [ ve ]
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