Discussion
A subtype discriminator is which of the following?
Answer: A
Correct answer: An attribute of the supertype whose values determine the subtype
The discriminator sits on the supertype because the question it answers - which kind of thing is this - must be answerable before the subtype is known. Its value directs each instance to its subtype: an employee type code of H, S or C sending the instance to hourly, salaried or consultant.
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