entity-relationship model

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entity-relationship model

(database, specification)
An approach to data modelling proposed by P. Chen in 1976. The model says that you divide your database in two logical parts, entities (e.g. "customer", "product") and relations ("buys", "pays for").

Entity-relationship diagrams can be used to represent a model.

["The entity-relationship model: toward a unified view of data", P.P. Chen, ACM Transactions on Database Systems 1:1 pp 9-36, 1976].
References in periodicals archive ?
It is an adaptation of accounting to relational databases using entity relationship diagrams as the documentation method (McCarthy, 1979; McCarthy, 1982).
These are teaching students to draw entity relationship diagram, teaching students to balance a data flow diagram, requiring students to learn data collection, teaching data modeling concepts, requiring students to complete a project requiring project management skills, teaching students to draw a complete data flow diagram, teaching students to complete a project that requires the use of both data and process modeling skills, and requiring students to complete a project as a team.
First, the entity relationship diagram and its use in a three phase data model approach.
Thus OH and PM were eliminated from consideration, and a second set of discussions focused on the six remaining functionalities: ACTION DIAGRAM (AD), CONSTRUCTION (C), DIALOGUE FLOW (DF), DIAGRAM TESTING (DT), ENTITY RELATIONSHIP DIAGRAM (ERD), and SCREEN DESIGN (SD).
2003); advocated the issues of genomic schema, genomic schema fragments and the current dimensions of genomic data modeling and these concepts have been described in entity relationship diagrams (ERD) by using Erwin.
The resulting Entity Relationship Diagrams will then feed into the next phase of development, that of Database and Application Design.
Our method uses entity relationship diagrams to provide a comprehensible picture of the problem domain and, perhaps, of some technology domains that are assumed as a context for the problem.
Toad Data Modeler - enables designers, developers and DBAs to easily create and maintain database structures across more than 20 database platforms by building entity relationship diagrams, generating SQL (DDL) scripts, reverse engineering databases, generating detailed HTML and RTF documentation, building data flow diagrams, and exporting to XML and other popular formats.
Full documentation and an on-line Javadoc on the Xng BDL API, a style guide to assist in creating custom applications, schema documentation and entity relationship diagrams that describe database columns, table relationships and their purpose.
It performs "push-button" translation of Entity Relationship Diagrams (ERDs) into Class Diagrams and vice versa, saving developers significant time in building error-free models.
DISCOVER allows software developers to navigate, comprehend, analyze dependencies, and manage source code through a variety of textual views and queries about files, functions, variables, and classes, as well as graphical views like call tree, class inheritance, entity relationship diagrams, and outlines.