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In a Books table with columns BookID, ISBN, and Title, which of the following sets of columns can be considered a candidate key?Group of answer choicesTitleISBNBookIDBookID and ISBN

Question

In a Books table with columns BookID, ISBN, and Title, which of the following sets of columns can be considered a candidate key?Group of answer choicesTitleISBNBookIDBookID and ISBN

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Solution

A candidate key is a set of one or more fields/columns that can identify a record uniquely in a table. There can be multiple candidate keys in one table. Each candidate key can qualify as a primary key.

  1. Title: This cannot be a candidate key because book titles are not unique. Multiple books can have the same title.

  2. ISBN: This can be a candidate key. The International Standard Book Number (ISBN) is a unique numeric commercial book identifier, which means no two books can have the same ISBN.

  3. BookID: This can also be a candidate key if it is unique for each book.

  4. BookID and ISBN: This can also be a candidate key. However, since both BookID and ISBN are unique individually, combining them is unnecessary.

So, the sets of columns that can be considered as candidate keys are ISBN, BookID, and the combination of BookID and ISBN.

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