Functional dependency: Difference between revisions

Revision as of 13:49, 13 July 2021

Revision as of 06:54, 7 August 2021

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{{about|a concept in relational database theory|functionalfunction dependencies in the Haskell programming language|type class}}

{{refimprove|date=October 2012}}

In [[relational database]] theory, a '''functional dependency''' is a '''[[Relational database#Constraints|constraint]]''' between two sets of attributes in a [[Relation (database)|relation]] from a database. In other words, a functional dependency is a constraint between two keys.