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Database - ER Model and Business Rules - Discussion

Discussion Forum : ER Model and Business Rules - General Questions (Q.No. 14)
ER Model and Business Rules
14.
Use of a supertype/subtype relationship is necessary when which of the following exists?
An instance of a subtype participates in a relationship that is unique to that subtype.
An instance of a subtype participates in a relationship that is the same as the other subtypes.
Attributes apply to all of the instances of an entity type.
No attributes apply to any of the instances of an entity type.
Answer: Option
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