Discussion :: Database System 2 - CS
- Use of a supertype/subtype relationship is necessary when which of the following exists?
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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. |
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Answer : Option A
Explanation :
Explanation Not Provided
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