functional dependency
<database >
Given a relation R (in a relational database), attribute Y of R is functionally dependent on attribute X of R and X of R functionally determines Y of R (in symbols R.X -> R.Y) if and only if each X in R has associated with it precisely one Y in R (at any one time). Attributes X and Y may be composite. This is very close to a function in the mathematical sense.
Last updated: 1997年09月01日
Nearby terms:
functional database ♦ functional dependency ♦ functionality ♦ functional language
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