Encyclopedia of Information Science and Technology, Second Edition 2009
DOI: 10.4018/978-1-60566-026-4.ch518
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Referential Constraints

Abstract: Inclusion dependencies support essential semantic aspects of the standard relational data model. An inclusion dependency is defined as the existence of attributes in a table whose values must be a subset of the values of the corresponding attributes in another table (Codd, 1990; Abiteboul, Hull, & Vianu, 1995; Connolly & Begg, 2004). Formally, it can be expressed as R[X]?S[Z]. R and S are relation names. With X and Z as compatible attributes, R[X] and S[Z] are the inclusion dependency’s left and right … Show more

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