entity-relationship model

(redirected from ER model)

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 ?
De aller forste bilene som er produsert og levert er Model S Signature Edition.
The 777 -300 ER model is preferred by airline operators due to its capability to fly long distances with more than 350 passengers.
Aqua Data Studio's Entity-Relationship Modeler has also been extended, and now has the ability to convert or translate an ER model from one database to another, along with the ability to export to ERX format, import object schemas into existing databases and compare schema objects of different models within the same or different databases.
For example, the birthdate and deathdate attributes in the Barker ER model shown in Figure 1.
However, ER models are further removed from natural language and may be harder for the domain expert to conceptualize.
The recent Unified Modeling language-2 (UML 2) has relation with the ER model and this is deployed in the chapter on Unified Modelling Language.
The student responses to the questionnaire suggested that most students appreciated the feature of being able to view the complete ER model.
MyTenFold is a superb choice for prototyping an application, demonstrating an application on a laptop, prototyping transaction or other applications improvements, bringing an enterprise ER model to life, working at the beach, and much more.
Aqua Data Studio's popular Entity-Relationship Modeler has also been extended this time around, now with the ability to convert or translate an ER model from one database to another.
Information is presented on E Series products, including the EP2 and ER models, said to be reliable, low-cost sensors that are ideal for new and retrofit factory automation applications.
The popular Entity-Relationship Modeler has seen improvements in creating, understanding and sharing ER models.
ER models guided doses and formulations for ongoing Phase 2b patient studies, which aim to confirm these relationships in patients, and establish the concentrations necessary for sleep maintenance.