This paper presents a similarity query generator for DBMSs. A user query which turns out to be too restrictive and returns an empty set of rows is relaxed and transformed into a similar one: the resulting set of tuples will resemble, at some degree, the set defined by the original query. The relaxing activity is based on fuzzy logic and the system provides a user interface to express the query, to obtain suggestions on possible search values and to validate, on the basis of semantic integrity rules, the expressed conditions.
FuzzyBase: A Fuzzy Logic Aid for Relational Database Queries / Davide, Gazzotti; L., Piancastelli; Claudio, Sartori; Beneventano, Domenico. - STAMPA. - (1995), pp. 385-394. (Intervento presentato al convegno Database and Expert Systems Applications, 6th International Conference, DEXA'95 tenutosi a London, United Kingdom nel September 4-8, 1995).