Fuzzy Database Query Languages and Their Relational Completeness Theorem

@article{Takahashi1993FuzzyDQ,
  title={Fuzzy Database Query Languages and Their Relational Completeness Theorem},
  author={Yoshikane Takahashi},
  journal={IEEE Trans. Knowl. Data Eng.},
  year={1993},
  volume={5},
  pages={122-125}
}
  • Y. Takahashi
  • Published 1 February 1993
  • Computer Science
  • IEEE Trans. Knowl. Data Eng.
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… 
A Calculus for Fuzzy Queries on Fuzzy Entity-Relationship Model
TLDR
A fuzzy entity-relationship model capable of representing imprecision and uncertainty in entities, attributes, and relationships is defined and a calculus for fuzzy queries along with operational semantics is described.
Fuzzy clustering algorithms for imprecise database queries: Automatic generation of fuzzy sets based on the natural distribution of data
  • A. Kowalczyk-Niewiadomy, A. Pelikant
  • Computer Science
    2012 Joint Conference New Trends In Audio & Video And Signal Processing: Algorithms, Architectures, Arrangements And Applications (NTAV/SPA)
  • 2012
TLDR
Implementation of fuzzy logic on database systems extends traditional SQL language with new mechanisms and new features, so the existing relational database systems will be more flexible, queries more intelligent and similar to ordinary communication methods.
A Process of Fuzzy Query on New Fuzzy Object Oriented Data Model
TLDR
New Fuzzy Object Oriented Data model (F-model) is presented and an extended FA-algebra based on fuzzy association patterns, fuzzy queries with fuzzy values and linguistic hedges are processed.
New semantics for the membership degree in fuzzy databases
  • N. Mouaddib, N. Bonanno
  • Computer Science
    Proceedings of 3rd International Symposium on Uncertainty Modeling and Analysis and Annual Conference of the North American Fuzzy Information Processing Society
  • 1995
TLDR
This paper proposes a definition of a fuzzy relational schema that include fuzzy integrity constraints (FIC), and explains the method to calculate the compatibility degree within the limit of individual constraints.
Updating extended possibility‐based fuzzy relational databases
TLDR
This article investigates three update operations for the fuzzy relational databases, which are Insertion, Deletion, and Modification, and develops the strategies and implementation algorithms of these operations.
Vague Query Based on Vague Relational Model
TLDR
Vague SQL is described, which is an extension of SQL for the vague relational model, and it is shown that Vague SQL combines the capabilities of a standard SQL with the power of manipulating vague relations.
Novel Model for the Computation of Linguistic Hedges in
TLDR
A model to handle the complexities by using fuzzy set theory is proposed, in which the Fuzzy Query with linguistic hedges is converted into Crisp Query, by deploying an application layer over the Structured Query Language.
Extending semantics of relational operators for vague queries
Relational Model of Data over Domains with Similarities: An Extension for Similarity Queries and Knowledge Extraction
TLDR
This work presents an extension of Codd's relational model of data, equipping each domain of attribute values with a similarity relation and modifying the classical relational model in order to account for issues generated by adding similarities.
Flexible databases supporting imprecision and uncertainty
TLDR
This paper presents an overview of database models and query languages for Relational Databases, and a Synopsis based approach for XML Fast Approximate Querying for relational database management.
...
...

References

SHOWING 1-4 OF 4 REFERENCES
Principles of database systems
TLDR
This book will help you to understand the principles of database systems book much better, and the system of this book of course will be much easier.
Fuzzy functional dependencies and lossless join decomposition of fuzzy relational database systems
TLDR
It is proved that with a suitable restriction on EQUAL, the design theory of a classical relational database with functional dependencies can be extended to fuzzy relations satisfying fuzzy functional dependencies.