Every time attribute A appears, it is matched with the same value of attribute B, but not the same value of attribute C. Therefore, it is true that:
A. A -> B
B. A -> C
C. A -> (B,C)
D. (B,C) -> A
Answer:A
Every time attribute A appears, it is matched with the same value of attribute B, but not the same value of attribute C. Therefore, it is true that:
A. A -> B B. A -> C C. A -> (B,C) D. (B,C) -> A
Explanation: Transitivity rule: Same as transitive rule in algebra, if a -> b holds and b -> c holds then a -> c also hold. a -> b is called as a functionally determines b.