Let R(ABCD) be a relation with functional dependencies
{A -> B,
C -> B,
B -> D}
What is the key for R (choose one)
a. AB
b. AC
c. AD
d. BD
Answer: B
Let R(ABCD) be a relation with functional dependencies {A -> B, C -> B, B -> D} What is the key for R (choose one)
Let R(ABCD) be a relation with functional dependencies
a. AB
b. AC
c. AD
d. BD
Answer: B