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9 Cards in this Set
- Front
- Back
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Sybtype |
A subgrouping of the entities in an entity type that is meaningful to the organization and that shares common attributes or relationships distinct from other subgroupings |
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Attribute Inheritance |
A property by which subtype entities inherit values of all attributes and instancers of all relationships of their supertype |
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Generalization |
The process of defining a more general entity type from a set of more specialized entity types |
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Specialization |
The process of defining one or more subtypes of the supertype/subtype relationships |
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Completeness Constraint |
A type of constraint that addresses whether an instance of a supertype must also be a member of at least on subtype |
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Total Specialization |
Each entity instance of a supertype must be a member of some subtype |
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Disjoint |
Can not combine subtypes |
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Overlap |
Can combine- purchased/manufacturing |
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Super/Sub Heirachy |
Each subtype can only have one supertype |
