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functional dependency

functional dependency in Technology

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.
(1997-09-01)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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