Candidate_key
Computing Dictionary

candidate key definition

database
One of several possible attributes or combinations of attributes which can be used to uniquely identify a body of information (a "record"). The chosen candidate key is called the primary key.
(2006-05-29)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a fool or simpleton; ninny.
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