entity-relationship model

(redirected from Entity relationship)
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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].
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Entity relationship diagramming none <5% 5-10% 11-15% 16-20% 21-25% 25-50% >= 50% 24 40 28 18 7 2 3 2 10.
The entity relationship diagram is the standard data technique for creating data models.
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4Keeps supports many of the commonly-used data modeling methodologies, including the Booch, Rumbaugh, and Shlaer-Mellor object class diagrams and the Chen and Martin entity relationship diagrams.
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GroundWorks supports and integrates four types of diagrams or editors used in the development of applications -- including Entity Relationship Diagrams, Data Flow Diagrams, Functional Decomposition Diagrams, and Process Specification Diagrams -- allowing users to view and work with a single application definition model.
Enhanced entity relationship diagramming provides comprehensive information to be visible on diagrams, which are assembled in seconds using the auto-draw feature.
The product supports data modeling and database design using entity relationship diagrams (ERDs) notations/methods by Martin, Bachman, IDEF1X, or Shlaer-Mellor.