Multiargument Relationships in Possibilistic Databases

Autor:	Krzysztof Myszkorowski
Rok vydání:	2015
Předmět:	Possibility distribution Theoretical computer science Fuzzy functional dependency Computer science Data integrity Representation (systemics) Functional dependency
Zdroj:	Beyond Databases, Architectures and Structures ISBN: 9783319184210 BDAS
DOI:	10.1007/978-3-319-18422-7_13
Popis:	In the paper we consider the possible coexistence of associations between k < n attributes of the n-ary relationship. The analysis is carried out using the theory of functional dependencies. We assume that attribute values are represented by means of possibility distributions. According to the representation of data the notion of fuzzy functional dependency has been appropriately extended. Its level is evaluated with the use of possibility and necessity measures. The dependencies between all n attributes describe the integrity constraints of the n-ary relationship and must not be infringed. They constitute a restriction for dependencies of fewer attributes. The paper formulates the rules to which fuzzy functional dependencies between (n-1) attributes of the n-ary relationship must be subordinated.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::96d929003cc3ce2ae05ff4513b98d322 https://doi.org/10.1007/978-3-319-18422-7_13 Zobrazit plný text záznamu