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Data Elements

QuestionAnswer
in software engineering is an abstract model that describes how data are represented and accessed. Formally define data elements and relationships among data elements for a domain of interest. A data model
the two key benefits that make a data model important to applications that use and exchange data Communication and precision
The main aim of data models? Tto support the development of information systems by providing the definition and format of data.
A data model instance Conceptual schema : Logical schema : Physical schema :
Conceptual schema : Describes the semantics of a domain. being the scope of the model.Consists of entity classes, representing kinds of things in the domain, and relationships asserts about associats between pairs of entity classes.
Conceptual schema : Often called a subject area model (SAM) or high-level data model (HDM), this model is used to communicate core data concepts, rules, and definitions to a business user as part of an overall application development or enterprise initiative.
Logical schema : describes the semantics, as represented by a particular data manipulation technology. This consists of descriptions of tables and columns, object oriented classes, and XML tags, among other things.
Created by: irynas
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