Affiliations: Faculty of Economic Informatics, University of
Economics in Bratislava, Dolnozemska cesta 1, 852 35 Bratislava, Slovakia.
Abstract: Institutes of official statistics work with mountains of data mainly
stored in relational databases. Often, users face the problem of how to express
their requirements for data by crisp query conditions, while, for users query
can be described more naturally by linguistic terms. Lingustic terms directly
included in queries enable more flexible retrieval of relevant data and data
dissemination. Fuzzy sets and fuzzy logic have two advantages in this field:
provide a better representation of the user requirements for data using
linguistic terms and allow examination of records that clearly meet the given
criteria, as well as those meeting the given criteria with certain degree. In
order to illustrate advantages of fuzzy queries, examples have been realized on
real data from official statistics.
Keywords: Fuzzy logic, flexible database queries, data retrieval