DBMS-Enchanced Entity-Relationship (EER) Model
DBMS-Enchanced Entity-Relationship (EER) Model
1. Subclasses are the sub-grouping of occurrences of entities in an entity type that shares common attributes or relationships distinct from other sub-groupings.
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2. In case of supertype, objects in one set are grouped or subdivided into one or more classes n many systems.
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3. Superclass is a generic entity type that has a relationship with one or more subtypes.
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5. The relationship between a supeclass and a subclasses is a one-to-many (1 . N) relationship.
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6. The U-shaped symbols in ERR model indicates that the supertype is a subset of the subtype.
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7. Attribute inheritance is the property by which supertype entities inherit values of all attributes of the subtype.
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8. Specialisation is the process of identifying subsets of an entity set of the superclass or supertype that share some distinguishing characterstic.
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9. Specialisation minimizes the difference between member of an entity by identifying the distinguishing and unique characterstics of each member
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10. Generalization is the process of identifying some common characterstics of a collection of entity sets and creating a new entity set that contains entities processing these common characterstics.
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