We've been getting a number of this type of question lately: short, and simple on the surface. Short questions...
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are wonderful, because they leave more room for the answer. Simple questions are even better, as long as they aren't too simple.
In this case, it's a good question but it might have been too simple.
A candidate key is any key that could be used as the primary key. This comes with two requirements: it cannot be null, and its values must be unique.
A composite key contains more than one column.
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