For a database relation R(a, b, c, where the domains of a, b, c, d include only the atomic values. The functional dependency a → c, b → d holds in the following relation
A. In 1NF not in 2NF
B. In 2NF not in 3NF
C. In 3NF
D. In 1NF
Answer:A
For a database relation R(a, b, c, where the domains of a, b, c, d include only the atomic values. The functional dependency a → c, b → d holds in the following relation
A. In 1NF not in 2NF B. In 2NF not in 3NF C. In 3NF D. In 1NF