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6 days ago
Which of the following is not true about representing subtypes in a relational database design?

• One table is created for the supertype and one for each subtype.

• All attributes of the supertype are added to the subtype relations.

• The key of the supertype is made the key of the subtypes.

• An instance of the supertype may be related to one instance each of several subtypes.
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Database Processing: Fundamentals, Design, and Implementation
Edition: 15th
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All attributes of the supertype are added to the subtype relations.
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