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Information Resources Management Association
Advancing the Concepts & Practices of Information Resources Management in Modern Organizations

Inclusion Dependencies

Inclusion Dependencies
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Author(s): Laura C. Rivero (Universidad Nacional del Centro de la Provincia de Buenos Aires, Argentina and Universidad Nacional de La Plata, Buenos Aires, Argentina)
Copyright: 2005
Pages: 6
Source title: Encyclopedia of Information Science and Technology, First Edition
Source Author(s)/Editor(s): Mehdi Khosrow-Pour, D.B.A. (Information Resources Management Association, USA)
DOI: 10.4018/978-1-59140-553-5.ch251


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Inclusion dependencies support an essential semantics of the standard relational data model. An inclusion dependency is defined as the existence of attributes (the left term) in a table R whose values must be a subset of the values of the corresponding attributes (the right term) in another table S (Abiteboul, Hull & Vianu, 1995; Codd, 1990; Connolly, Begg & Strachan, 1999; Date, 2000). When the right term conforms a unique column or a primary key (K) for the table S, the inclusion dependency is key-based (also named referential integrity restriction, rir). In this case, the left term is a foreign key (FK) in R and the restriction is stated as R[FK] <

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