Fuzzy database query languages and their relational completenesstheorem |
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Authors: | Takahashi Y |
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Affiliation: | NTT Network Inf. Syst. Lab., Kanagawa; |
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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 |
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