Question

Every relation that has at least one key by default, which is the combination of all its attributes is called _________ by default, which specifies uniqueness constraint.

• A. Financial key
• B. Super-key
• C. Attribute key
• D. Candidate key

Answer 1

The correct option is B Super-key

Each data record, which corresponds to a tuple of a relation, in a table must be distinct. Every relation has at least one key by default, which is the combination of all its attributes. This key is called super-key by default.