Data model: Difference between revisions

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A '''data model''' (or '''datamodel''')<ref>{{cite web|title= datamodel - UML Domain Modeling - Stack Overflow|url= https://stackoverflow.com/a/3835214|website= Stack Overflow|publisher= Stack Exchange Inc.|access-date= 4 February 2017}}</ref><ref name="w3cxpath">{{cite web|title= XQuery and XPath Data Model 3.1|url= https://www.w3.org/TR/xpath-datamodel-3/|website= World Wide Web Consortium (W3C)|publisher= W3C|access-date= 4 February 2017}}</ref><ref name="npmdatamodel">{{cite web|title= datamodel|url= https://www.npmjs.com/package/datamodel|website= npm|publisher= npm, Inc.|access-date= 4 February 2017}}</ref><ref>{{cite web|title= DataModel (Java EE 6)|url= http://docs.oracle.com/javaee/6/api/javax/faces/model/DataModel.html|website= Java Documentation|publisher= Oracle|access-date= 4 February 2017}}</ref><ref>{{cite web|last1= Ostrovskiy|first1= Stan|title= iOS: Three ways to pass data from Model to Controller|url= https://medium.com/ios-os-x-development/ios-three-ways-to-pass-data-from-model-to-controller-b47cc72a4336#.ma7pr7no7|website= Medium|publisher= A Medium Corporation|access-date= 4 February 2017}}</ref> is an [[abstract model]] that organizes elements of [[data]] and standardizes how they relate to one another and to the properties of real-world entities. For instance, a data model may specify that the data element representing a car be composed of a number of other elements which, in turn, represent the color and size of the car and define its owner.

Kgf chapter 2 haaaaaa haaaaaa haaaaaaa haaaaa good movie must watch PADHAI LIKHI TO HOTI RAHEGI 🙏🙏TheThe term '''data model''' can refer to two distinct but closely related concepts. Sometimes it refers to an abstract formalization of the objects and relationships found in a particular application ___domain: for example the customers, products, and orders found in a manufacturing organization. At other times it refers to the set of concepts used in defining such formalizations: for example concepts such as entities, attributes, relations, or tables. So the "data model" of a banking application may be defined using the entity-relationship "data model". This article uses the term in both senses.

[[File:Data modeling context.svg|thumb|360px| Overview of a data-modeling context: Data model is based on Data, Data relationship, Data semantic and Data constraint. A data model provides the details of [[information]] to be stored, and is of primary use when the final product is the generation of computer [[software code]] for an application or the preparation of a [[functional specification]] to aid a [[computer software]] make-or-buy decision. The figure is an example of the interaction between [[business process modeling|process]] and data models.<ref name="SS93">Paul R. oftenSmith represented& inRichard graphicalSarfaty form.Publications, LLC 2009</ref name="MRM99">]]

A data model explicitly determines the structure of data. Data models are typically specified by a data specialist, data librarian, or a digital humanities scholar in a [[data modeling]] notation. These notations are often represented in graphical form.<ref name="MRM99">

Michael R. McCaleb (1999). [http://nvl.nist.gov/pub/nistpubs/jres/104/4/html/j44mac.htm#apa "A Conceptual Data Model of Datum Systems"] {{Webarchive

|url= https://web.archive.org/web/20080921063005/http://nvl.nist.gov/pub/nistpubs/jres/104/4/html/j44mac.htm#apa |date= 2008-09-21