Abstract
Since Codd introduced the relational database model and functional dependencies [Codd 1970], the semantics of relationships between the attributes of a database has been extensively studied by many computer scientists. In this chapter we introduce an application of the calculus of binary relations to the (n-ary) relational database model. This consists of using the notion of difunctional relations to define difunctional dependencies in the relational database model. Difunctional dependencies are weaker than functional dependencies, but more regular than the other well-known dependencies.
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© 1997 Springer-Verlag Wien
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Jaoua, A., Belkhiter, N., Ounalli, H., Moukam, T. (1997). Databases. In: Brink, C., Kahl, W., Schmidt, G. (eds) Relational Methods in Computer Science. Advances in Computing Sciences. Springer, Vienna. https://doi.org/10.1007/978-3-7091-6510-2_13
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DOI: https://doi.org/10.1007/978-3-7091-6510-2_13
Publisher Name: Springer, Vienna
Print ISBN: 978-3-211-82971-4
Online ISBN: 978-3-7091-6510-2
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