Querying fuzzy relational databases through fuzzy domain calculus

Querying fuzzy relational databases through fuzzy domain calculus

1, 2 a 3 Jose Galindo, * Juan Miguel Medina, M Carmen Aranda ́ Departamento Lenguajes y Ciencias de la Computacion, Universidad de ́ Malaga, E.T.S.I. Informatica 29071 Malaga, Spain ́ ́ ́ Departamento Ciencias de la Computacion e I.A., Universidad de Granada, ́ Av Andalucia no 38, 18071 Granada, Spain Departamento Lenguajes y Ciencias de la Computacion, Universidad de ́ Malaga, E.T.S.I. Informatica 29...

Some issues of fuzzy querying in relational databases

Fuzzy Relational Calculus

We provide a self contained survey of the state of art of the fuzzy binary relations and some of their applications.

Fuzzy Join Dependency in Fuzzy Relational Databases

The join dependency provides the basis for obtaining lossless join decomposition in a classical relational schema. The existence of Join dependency shows that that the tables always represent the correct data after being joined. Since the classical relational databases cannot handle imprecise data, they were extended to fuzzy relational databases so that uncertain, ambiguous, imprecise and part...

Fuzzy Classification on Relational Databases

The fuzzy logic theory proposed by Zadeh (1965) is based on intuitive reasoning and takes into account human subjectivity and imprecision. Unlike statistical data mining techniques such as cluster or regression analysis, fuzzy logic enables the use of nonnumerical values and introduces the notion of linguistic variables (Zadeh, 1975a, 1975b, 1975c). Using linguistic terms and variables hides Ab...