CSE :: Database System 2 - CS
- A subtype discriminator is which of the following?
- When an entity instance may be a member of multiple subtypes or it does not have to be a member of a subtype, it is which of the following?
- A subtype entity name should be which of the following?
- Use of a supertype/subtype relationship is necessary when which of the following exists?
- Which of the following is not one of the three ways to classify an action assertion?
- An action assertion is a statement that expresses some aspect of the static structure of the organization.
- A subtype discriminator of the supertype is an attribute whose values determine the target subtype(s).
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A.
An instance of a subtype participates in a relationship that is unique to that subtype. |
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B.
An instance of a subtype participates in a relationship that is the same as the other subtypes. |
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C.
Attributes apply to all of the instances of an entity type. |
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D.
No attributes apply to any of the instances of an entity type. |