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Question
Which of the following is not true about representing subtypes in a relational database design?A) One table is created for the supertype and one for each subtype.
B) All of the attributes of the supertype are added to the subtype relations.
C) The key of the supertype is made the key of the subtypes.
D) An instance of the supertype may be related to one instance each of several subtypes.
Answer
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