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Nondeterministic dependencies in relations: An extention of the concept of functional dependency |
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| Authors: | R. Haux U. Eckert |
| Affiliation: | Institute of Medical Documentation, Statistics and Computer Science, University of Heidelberg, Im Neuenheimer Feld 325, D-6900 Heidelberg, F.R. Germany;Medical Computing Center, University of Heidelberg, Im Neuenheimer Feld 293, D-6900 Heidelberg, F.R. Germany |
| Abstract: | In the present article, some special semantic integrity constraints—so called nondeterministic dependencies—are proposed. These dependencies can be regarded as stochastic extensions of functional dependencies. After some basic definitions, the concept of nondeterministic dependency is introduced. Examples are given and an implementation for a statistical analysis system is described. Some properties are discussed. |
| Keywords: | nondeterministic dependencies functional dependencies relational data model data- and methodbase systems statistical analysis systems database systems |
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