Suppose R is a relation with attributes A1, A2, A3, A4.
The only key of R is {A1, A2}. So, how many super-keys do R have?
a. 4
b. 8
c. 12
d. 16
Answer: A
Suppose R is a relation with attributes A1, A2, A3, A4. The only key of R is {A1, A2}. So, how many super-keys do R have?
Suppose R is a relation with attributes A1, A2, A3, A4.
a. 4
b. 8
c. 12
d. 16
Answer: A