Which of the following is known as minimal super key?Primary keyCandidate keyForeign keyNone
Question
Which of the following is known as minimal super key?Primary keyCandidate keyForeign keyNone
Solution
The answer is Candidate key. A Candidate key is known as a minimal super key. A super key is an attribute (or set of attributes) that can be used to identify a record uniquely in a relation. A Candidate key is a minimal set of attributes necessary to identify a record without any extraneous data. This means it is a super key but with the minimal set of attributes. A primary key is a type of candidate key that is usually chosen as the main method of identifying records in a table. A foreign key is used to prevent actions that would destroy links between tables.
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what is a primary key
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Which of the following options are correct regarding these three keys (Primary Key, Super Key, and Candidate Key) in a database?I. Minimal super key is a candidate keyII. Only one candidate key can be a primary keyIII. All super keys can be a candidate keyIV. We cannot find a primary key from the candidate keyI and IIII and IIII and IIIII and IV
State the key that can be used as a primary key.
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