Candidate key

In the relational model of databases, a candidate key of a relation is a minimal superkey for that relation; that is, a set of attributes such that:

The constituent attributes are called prime attributes. Conversely, an attribute that does not occur in ANY candidate key is called a non-prime attribute.

单词	Prime attribute
释义	Prime attribute 英语百科 Candidate key In the relational model of databases, a candidate key of a relation is a minimal superkey for that relation; that is, a set of attributes such that: The constituent attributes are called prime attributes. Conversely, an attribute that does not occur in ANY candidate key is called a non-prime attribute.
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Prime attribute

Candidate key