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Which key of a relation is …

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Which key of a relation is always a minimal keys?

    • Posted by Binay Sharma 4 years, 4 months ago

    CBSE > Class 10 > Computer Applications (165)
    • 1 answers

    Meghna Thapar 4 years, 4 months ago

    Candidate key is a set of attributes (or attribute) which uniquely identify the tuples in a relation or table. As we know that Primary key is a minimal super key, so there is one and only one primary key in any relation but there is more than one candidate key can take place. A superkey is a set of attributes within a table whose values can be used to uniquely identify a tuple. A candidate key is a minimal set of attributes necessary to identify a tuple; this is also called a minimal superkey

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