DBMS · Question 15 · Hard
Relation R(A, B, C) has the functional dependencies AB → C and C → B. Which is the highest normal form R satisfies?
- 3NF but not BCNF
- BCNF
- 2NF but not 3NF
- 1NF only
Answer and explanation
Answer: A. 3NF but not BCNF
Explanation: The candidate keys are AB and AC, so every attribute is prime. C → B satisfies 3NF because B is prime, but it violates BCNF because C is not a superkey.
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