Explanation:Here the id is the only attribute which can be taken as a key. Other attributes are not uniquely identified . 3. The subset of super key is a candidate key under what condition ?
A. No proper subset is a super key
B. All subsets are super keys
C. Subset is a super key
D. Each subset is a super key
Answer:A
Explanation:Here the id is the only attribute which can be taken as a key. Other attributes are not uniquely identified . 3. The subset of super key is a candidate key under what condition ?
A. No proper subset is a super key B. All subsets are super keys C. Subset is a super key D. Each subset is a super key
Explanation:The subset of a set cannot be the same set.Candidate key is a set from a super key which cannot be the whole of the super set 4. A _____ is a property of the entire relation, rather than of the individual tuples in which each tuple is unique.