entity-relationship model

(redirected from E-R diagram)

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 ?
An Entity-Relationship diagram, commonly referred to as an E-R diagram, shows the main things (or entities) that have a collection of related data elements (fields) we want to store and the relationships between these entities.
Both the schema and the E-R diagram are often shown on one page.
In many situations the E-R diagram might already be available - for example, if the target application is a hypermedia interface to an existing database.
Figure 5 shows the E-R diagram for the handbook application.
To differentiate them from the associative relationships appearing in the E-R diagram.
This paper will present the E-R diagrams and table designs for the databases associated with shopping carts of each Tier, as well as suggestions for appropriate use of tiered shopping carts.