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Enhanced ERD Modeling

Enhanced ERD Modeling. Superclass an entity type containing one or more subgroupings that need to be identified Subclasses a distinct subgroup of an entity type subclass inherits all the properties of its superclass. Enhanced ERD Generalization/Specialization. Superclass.

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Enhanced ERD Modeling

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  1. Enhanced ERD Modeling • Superclass • an entity type containing one or more subgroupings that need to be identified • Subclasses • a distinct subgroup of an entity type • subclass inherits all the properties of its superclass

  2. Enhanced ERDGeneralization/Specialization Superclass { optiona/mandatory disjoint (or) more than one (and) } subclass1 subclass2 subclass3

  3. Enhanced ERDAggregation Superclass contains subclass1 subclass2 subclass3

  4. Enhanced ERDComposition Superclass Composed of elements from all subclasses subclass1 subclass2 subclass3

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