A candidate
key is a minimal set of attribute that uniquely identifies an object or link.
A class or
association may have one or more candidate keys,each of which may have
different combinations and numbers of attributes.
Candidate key is a term commonly used within the
database community . however, candidate key is really not a database concept;
candidate key is a logical concept. Each candidate key constraints the
instances in class or the multiplicity of an association. Most programming languages lack the notation
of a candidate key. A candidate key is defined in an object model with braces.
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