Super Entity & Sub Entity

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Presentation transcript:

Super Entity & Sub Entity Yong Choi School of Business CSU, Bakersfield

Sharing inherited attributes

Constraints Completeness Constraints Disjointness Constraints Total Specialization Partial Specialization Disjointness Constraints Disjoint Rule Overlap Rule

Note: Motorcycle is not include in this data model.

Subtype Discriminator: It is an attribute of a supertype whose values determine the target subtype.

Figure 3-10 on Page 105

Figure 3-10 with subtype discriminators

Exercise Question #8 on page 114 Identify inherited attributes Identify distinguishable or distinctive attribute

Exercise Question #9 on page 114 Identify inherited and attributes Identify or distinctive attribute Additional regular entity? Multivalued attribute?