Title :
Fuzzy database query languages and their relational completeness theorem
Author :
Takahashi, Yoshikane
Author_Institution :
NTT Network Inf. Syst. Lab., Kanagawa, Japan
fDate :
2/1/1993 12:00:00 AM
Abstract :
Two fuzzy database query languages are proposed. They are used to query fuzzy databases that are enhanced from relational databases in such a way that fuzzy sets are allowed in both attribute values and truth values. A fuzzy calculus query language is constructed based on the relational calculus, and a fuzzy algebra query language is also constructed based on the relational algebra. In addition, a fuzzy relational completeness theorem such that the languages have equivalent expressive power is proved
Keywords :
fuzzy set theory; information retrieval; query languages; relational databases; attribute values; fuzzy algebra query language; fuzzy calculus query language; fuzzy database query languages; fuzzy sets; relational calculus; relational completeness theorem; truth values; Algebra; Calculus; Data engineering; Database languages; Database systems; Fuzzy sets; Fuzzy systems; Humans; Relational databases; User interfaces;
Journal_Title :
Knowledge and Data Engineering, IEEE Transactions on
