Discussion
A relation in this form is free of all modification anomalies.
Answer: D
Correct answer: Domain/key normal form
Fagin proved that a relation in domain/key normal form has no modification anomalies of any kind, and conversely that any relation free of them is in DK/NF. It is defined by requiring that every constraint on the relation follow from its domain and key definitions alone. The difficulty is that there is no general procedure for putting a relation into it.
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