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ER Model and Business Rules
A subtype discriminator is which of the following?
An attribute of the supertype whose values determine the subtype
An attribute of the subtype whose values determine the supertype
An attribute of the supertype whose values determine the supertype
An attribute of the subtype whose values determine the subtype
Correct Answer:
An attribute of the supertype whose values determine the subtype
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ER Model and Business Rules
Use of a supertype/subtype relationship is necessary when which of the following exists?
Inheritance is which of the following?
When an entity instance must be a member of only one subtype, it is which of the following?
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Which of the following statements concerning business rules is true?
Overlapping and disjoint subtypes have different approaches on how the subtype discriminator is applied.
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A supertype is an entity type that shares common attributes or relationships distinct from other subgroupings.
Total specialization is represented by double lines between the supertype and subtype on an EER.
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