SQLf query functionality on top of a regular relational database management system. (English) Zbl 0964.68047

Pons, Olga (ed.) et al., Knowledge management in fuzzy databases. Heidelberg: Physica-Verlag. Stud. Fuzziness Soft Comput. 39, 171-190 (2000).
Summary: This paper is mainly concerned with the extension of database management systems querying capabilities, so that users may address queries involving preferences and get discriminated answers. The use of flexible (gradual) predicates interpreted in the framework of the fuzzy set theory is advocated for defining a query language, called SQLf. This language enlarges the functionalities offered by SQL and it is considered here from a query processing point of view.
For the entire collection see [Zbl 0934.00014].


68P15 Database theory