Management
"EER or the enhanced entity–relationship model, also called as extended entity–relationship model in computer science is a high-level or conceptual data model incorporating extensions to the original ER (entity–relationship) model, that is used in the design of databases i.e. it is a high-level data model that incorporates the extensions to the original ER model
It was developed to reflect more precisely the properties and constraints that are found in more complex databases, such as in engineering design and manufacturing (CAD/CAM), telecommunications, complex software systems and geographic information systems (GIS).
This model is a diagrammatic technique for displaying the concepts like :
1. Sub Class and Super Class
2. Union or Category
3. Specialization and Generalization
4. Aggregation
Also, some features are :
i) It creates a design more accurate to database schemas.
ii) It includes all modeling concepts of the ER model.
iii) It reflects the data properties and constraints more precisely.
iv) Diagrammatic technique helps for displaying the EER schema.
v) It is used to represent a collection of objects that is union of objects of different of different entity types.
vi) It includes the concept of specialization and generalization."
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