The best definition of a candidate key is: A minimal set of attributes that uniquely identifies each tuple.

Here's why:

1. A candidate key is a set of one or more attributes that can uniquely identify a tuple (or row) in a relation (or table).

2. The key word here is "minimal". This means that no subset of the attributes can be used to uniquely identify a tuple. In other words, every attribute in the candidate key is necessary for identification.

3. This distinguishes candidate keys from superkeys, which can also uniquely identify tuples but may include extra, unnecessary attributes.

4. So, while it's true that no two tuples will share the same values for a candidate key (making the first option somewhat correct), and that a candidate key does uniquely identify each tuple (making the third option somewhat correct), the second option is the most complete and accurate definition.

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The best definition of a candidate key is: A minimal set of attributes that uniquely identifies each tuple.

Here's why:

1. A candidate key is a set of one or more attributes that can uniquely identify a tuple (or row) in a relation (or table).

2. The key word here is "minimal". This means that no subset of the attributes can be used to uniquely identify a tuple. In other words, every attribute in the candidate key is necessary for identification.

3. This distinguishes candidate keys from superkeys, which can also uniquely identify tuples but may include extra, unnecessary attributes.

4. So, while it's true that no two tuples will share the same values for a candidate key (making the first option somewhat correct), and that a candidate key does uniquely identify each tuple (making the third option somewhat correct), the second option is the most complete and accurate definition.

Knowee AI · Accepted Answer

The best definition of a candidate key is: A minimal set of attributes that uniquely identifies each tuple.

Here's why:

1. A candidate key is a set of one or more attributes that can uniquely identify a tuple (or row) in a relation (or table).

2. The key word here is "minimal". This means that no subset of the attributes can be used to uniquely identify a tuple. In other words, every attribute in the candidate key is necessary for identification.

3. This distinguishes candidate keys from superkeys, which can also uniquely identify tuples but may include extra, unnecessary attributes.

4. So, while it's true that no two tuples will share the same values for a candidate key (making the first option somewhat correct), and that a candidate key does uniquely identify each tuple (making the third option somewhat correct), the second option is the most complete and accurate definition.

Which is the best definition of a candidate key?Group of answer choicesA set of attributes for which no two tuples share all the same valuesA minimal set of attributes that uniquely identifies each tupleAn attribute that uniquely identifies each tuple

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