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Line 118: === Closure of functional dependency === The closure of a set of values is ~~essentially~~ the ~~full~~ set of ~~values~~attributes that can be determined ~~from~~using aits ~~set~~functional ~~of known values~~dependencies for a given relationship ~~using its functional dependencies~~. One uses [[Armstrong's axioms]] to provide a proof - i.e. reflexivity, augmentation, transitivity. Given <math>R</math> and <math>F</math> a set of FDs that holds in <math>R</math>:

Functional dependency: Difference between revisions