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NIELIT 2016 DEC Scientist B (IT) - Section B: 36

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Option C. Candidate Keys.

Candidate key is a set of attributes that uniquely identify tuples in a table. 

We can have more than one candidate keys for a relational schema.

Any one of the key is chosen from candidate key as Primary Key.

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CANDIDATE KEY is a set of attributes that uniquely identify tuples in a table. Candidate Key is a super key with no repeated attributes. The Primary key should be selected from the candidate keys. Every table must have at least a single candidate key. A table can have multiple candidate keys but only a single primary key.

Option C is Correct

 

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