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Fuzzy database query languages and their relational completeness theorem

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1 Author(s)
Takahashi, Y. ; NTT Network Inf. Syst. Lab., Kanagawa, Japan

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

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Knowledge and Data Engineering, IEEE Transactions on  (Volume:5 ,  Issue: 1 )