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Functional dependency

In relational database theory, a functional dependency (FD) is constraint between two attribute sets, whereby values in one set (the determinant set) determine the values of the other set (the dependent set). A functional dependency between a determinant set X and a dependent set Y can be described as follows:

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Applications to normalization

Lossless join decompositionLookup tableOLTPOLAPForeign key
11 related topics

Overview

ConstraintDeterminantRelationProjectionFunction
23 related topics

Properties and axiomatization of functional dependencies

AxiomInference rulesSchemataIf and only if
4 related topics

Examples

Vehicle identification numberTransitiveInteger
3 related topics

Topics to explore

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Overview

Examples

Properties and axiomatization of functional dependencies

Covers and equivalence

Applications to normalization

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Map overview Semantic statistics

Functional dependency

Nodes48
Edges47
Triples36
Avg. degree1.96
Density0.041667
Components1

How this topic connects Entity context

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Functional dependency

Top relations

related to Cars · 11
Functional dependency → Assuming, Each, EngineCapacity, For, However, On, One, Suppose, This, VehicleModel, VIN
related to Heath's theorem · 10
Functional dependency → An, Heath's, Heaths, Intuitively, OLAP, OLTP, Pi, This, XY, XZ
related to Lectures · 8
Functional dependency → ID, Let's, Semester, StudentID, TA, The, This, We
related to Employee department · 3
Functional dependency → ID, Note, This
related to Irreducible function depending set · 3
Functional dependency → Each, It, Reducing
is a · 1
Functional dependency → employee department model.This case represents an example where multiple functional dependencies are embedded in a single representation of data

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Important terminology

functional dependency dependencies displaystyle set relation one attribute database two sets fd values attributes normalization xz would pi also example

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Functional dependencyis aemployee department model.This case represents an example where multiple functional dependencies are embedded in a single representation of data0.90text
Functional dependencyrelated to CarsSuppose0.60section
Functional dependencyrelated to CarsEach0.60section
Functional dependencyrelated to CarsVIN0.60section
Functional dependencyrelated to CarsOne0.60section
Functional dependencyrelated to CarsEngineCapacity0.60section
Functional dependencyrelated to CarsAssuming0.60section
Functional dependencyrelated to CarsOn0.60section
Functional dependencyrelated to CarsThis0.60section
Functional dependencyrelated to CarsHowever0.60section
Functional dependencyrelated to CarsFor0.60section
Functional dependencyrelated to CarsVehicleModel0.60section

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