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Difference between Super Key and Candidate Key

Keys are the essential elements of any relational database. It identifies each tuple in a table. Here in this article, we discuss important keys, super key and candidate key. Super Key is a set of attributes or columns that uniquely identifies each row table whereas, a candidate key is a set of attributes that recognizes the tuples in a relation, or table. Let’s analyze more differences between super key and candidate key.

What is Super Key?

Super Key is a set of attributes or columns that uniquely identifies each row in a table. In other words, we can say that It is a combination of columns that identifies a row in a table.

What is a Candidate Key?

A candidate key is a set of attributes that recognizes the tuples in relation or table.

Difference between Super Key and Candidate Key

S.NO Super Key Candidate Key
1. It is a set of attributes or columns that uniquely identifies each row in a table. It is a set of attributes that recognizes the tuples in relation or table.
2. The count of super keys is more as compared to the candidate key. The count of candidate keys is less compared to the super keys.
3. Every super key cannot be a candidate key. All candidate keys are super keys.
4. Numerous candidate keys collectively make the guidelines to choose the primary keys. Numerous super keys collectively make the guidelines to choose the candidate keys.
5. The attributes of the super key can have NULL values. The attributes of the candidate can also have NULL values.

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