Which of the Following Is Not True About Representing Subtypes

question 78

Multiple Choice

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)A subtype and its supertype are representations of the same underlying table.
• E)An instance of the supertype may be related to one instance each of several subtypes.

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