

MCQOPTIONS
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1. |
Consider a relational table with a single record for each registered student with the following attributes: |
A. | Bank Account_Number is a candidate key |
B. | Registration Account_Number can be primary key |
C. | UID is a candidate key if all students are from the same country |
D. | If S is a superkey such that S UID is NULL then S UID is also a super key |
Answer» B. Registration Account_Number can be primary key | |