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Lexikon

functional dependency


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)

In addition suitable contents:
[ = ] [ al ] [ am ] [ an ] [ ar ] [ arc ] [ as ] [ at ] [ attribute ] [ b ] [ ba ] [ base ] [ be ] [ bo ] [ ca ] [ ch ] [ ci ] [ cl ] [ co ] [ com ] [ composite ] [ data ] [ database ] [ de ] [ du ] [ ec ] [ ed ] [ er ] [ es ] [ et ] [ fi ] [ file ] [ function ] [ functional ] [ G ] [ h ] [ hr ] [ id ] [ il ] [ in ] [ io ] [ is ] [ it ] [ la ] [ Lex ] [ lose ] [ ls ] [ ly ] [ ma ] [ mo ] [ mod ] [ module ] [ mp ] [ na ] [ nc ] [ ne ] [ nl ] [ ns ] [ om ] [ pe ] [ ph ] [ pr ] [ query ] [ rc ] [ re ] [ relation ] [ relational database ] [ se ] [ si ] [ sit ] [ so ] [ sy ] [ T ] [ th ] [ to ] [ tr ] [ tt ] [ ve ] [ X ] [ Y ]






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