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Which forms has a relation that possesses data about an individual entity?

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Which forms has a relation that possesses data about an individual entity? (a) 2NF (b) 3NF (c) 4NF (d) 5NF I have been asked this question in a job interview. My question is taken from Multivalued Dependencies topic in division Normalization of Database Management Select the correct answer from above options Interview Questions and Answers, Database Interview Questions and Answers for Freshers and Experience

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Right choice is (c) 4NF Best explanation: A Table is in 4NF if and only if, for every one of its non-trivial multivalued dependencies X \twoheadrightarrow Y, X is a superkey—that is, X is either a candidate key or a superset thereof.

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