Which one of the following is a set of one or more attributes taken collectively to uniquely identify a record?
A. Candidate key
B. Sub key
C. Super key
D. Foreign key
Answer:A
Which one of the following is a set of one or more attributes taken collectively to uniquely identify a record?
A. Candidate key B. Sub key C. Super key D. Foreign key
Explanation:Super key is the superset of all the keys in a relation. 2. Consider attributes ID , CITY and NAME . Which one of this can be considered as a super key ?