Yugoslav Journal of Operations Research 2011 Volume 21, Issue 2, Pages: 239-251
https://doi.org/10.2298/YJOR1102239H
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Fuzzy improvement of the SQL
Hudec Miroslav (Institute of Informatics and Statistics, Bratislava, Slovakia)
Structured Query Language (SQL) is used to obtain data from relational
databases. Fuzzy improvement of SQL queries has advantages in cases when the
user cannot unambiguously define selection criteria or when the user wants to
examine data that almost meet the given criteria. In this paper we examine a
realization of the fuzzy querying concept. For this purposes the fuzzy
generalized logical condition for the WHERE part of the SQL is created. It
allows users to create queries by linguistic terms. The proposed model is an
extension of the SQL so that no modification inside databases has to be
undertaken.
Keywords: SQL, fuzzy query, generalized logical condition, database