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Was (wer) ist Entity-Relationship model - definition
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 ].
(1998-03-20)
Entity–relationship model
An entity–relationship model (or ER model) describes interrelated things of interest in a specific domain of knowledge. A basic ER model is composed of entity types (which classify the things of interest) and specifies relationships that can exist between [(instances of those entity types).
Enhanced entity–relationship model
ENHANCEMENT OF THE ER MODEL THAT DESCRIBES INTER-RELATED THINGS OF INTEREST IN A SPECIFIC DOMAIN OF KNOWLEDGE WITH SUBCLASS / INHERITANCE SUPPORT
Enhanced entity-relationship; Enhanced Entity-Relationship Model; Extended entity–relationship model; Enhanced entity-relationship model; Extended entity-relationship model; EER model
The enhanced entity–relationship (EER) model (or extended entity–relationship model) in computer science is a high-level or conceptual data model incorporating extensions to the original entity–relationship (ER) model, used in the design of databases.
Wikipedia
Entity–relationship model
An entity–relationship model (or ER model) describes interrelated things of interest in a specific domain of knowledge. A basic ER model is composed of entity types (which classify the things of interest) and specifies relationships that can exist between [(instances of those entity types).
