If a relation is in 1NF and the key consists of a single attribute, then the relation is automatically in
Correct answer: B. 2NF
- A. 3NF
- B. 2NF
- C. Both (a) and (b)
- D. BCNF
Explanation
First Normal Form (1NF): A relation is in 1NF if all its underlying domains contain atomic values (indivisible units of data) and there are no repeating groups within a table.Second Normal Form (2NF): A relation is in 2NF if it fulfills the conditions of 1NF and also eliminates partial dependencies. A partial dependency exists when a non-key attribute relies on only a part of the composite primary key.Why a single-attribute key guarantees 2NF:When a relation has a single attribute as its primary key, there's no possibility of partial dependencies. By definition, a partial dependency involves a non-key attribute depending on a subset of the primary key. With a single-key attribute, there are no subsets to be dependent on. Therefore, the relation inherently satisfies the requirement for 2NF
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