Design of Database Sampler with Functional Dependencies
Objectives of Database Design Functional Dependencies 1st Normal Form Decomposition Boyce-Codd Normal Form 3rd Normal Form Multivalue Dependencies
... customers custom er Account- manager Pedro Ana Carla Francisco Pedro Francisco Pedro Maria Decomposition to BCNF: managers-branch branch Account- manager office Lisboa[r] ...
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Design Theory for Relational Databases: Functional Dependencies and Normalization
... • To check if a relation schema R is in BCNF, it suffices to check only the dependencies in the given set F. – If none of the dependencies in F causes a violation of BCNF, then none[r] ...
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XML Database Schema Refinement through Functional Dependencies and Normalization
... Keywords: - XML FD, XML Normal Form, XML Normalization, XML schema, XML Path 1-Introduction With the widespread use of the Web application and the accessibility of a huge amount of electronic data, XML has been used as ...
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Functional Dependencies and Normalization
... R It may not provide true foreign keys. • ... but this is an issue of lack of support of a relatively simple feature in current SQL, not a fundamental design issue. D In the worst case, exhaustive search is ...
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Conditional-Functional-Dependencies Discovery
... of dependencies existing in an instance of a relation received considerable interest as it allowed automatic database ...[1], database management ([5],[9]), reverse engi- neering [17] and query ...
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Guaranteeing no interaction between functional dependencies and tree like inclusion dependencies
... Relation; Database; Logical implication; Functional dependency; Inclusion dependency 1 Introduction The implication problem for FDs and INDs is the problem of deciding for a given set Σ of FDs and INDs ...
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Discovering functional dependencies from ontologies
... the design decisions made when devising the system (for instance, denormalization of data) and these decisions either made to fulfill the system requirements (for instance, improve query answering, avoid ...
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Conditional Functional Dependencies for Data Cleaning
... tional functional dependencies (CFD s ), and study their ap- plications in data ...tional dependencies ( FD s ) that were developed mainly for schema design, CFD s aim at capturing the ...
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Reasoning about Fuzzy Functional Dependencies
... fuzzy functional dependencies, logic, implication ...the design of note- worthy relational schema for the sake of the database consistence and therefore to avoid the problems of redundances, ...
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4 Incremental Discovery of Functional Dependencies
... Abstract. Functional dependencies (fds) were conceived in the early ’70s, and were mainly used to verify database design and assess data ...
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Semi-automatic support for evolving functional dependencies
... a database by means of data, a vital resource on which decision-making processes are ...a database must satisfy the semantic conditions expressed by the schema plus integrity ...and database ...
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Discovering (frequent) constant conditional functional dependencies
... Initial work on dependency-based data quality methods focused on traditional dependencies, such as functional dependencies (FDs), that were mainly developed for database design 40 years ...
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Effective Pruning for the Discovery of Conditional Functional Dependencies
... in database design to enforce the semantical constraints for maintaining high quality ...as functional dependencies at the database design ...
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Chapter 5: FUNCTIONAL DEPENDENCIES AND NORMALIZATION FOR RELATIONAL DATABASES
... A tuple in EMP_PROJ1 means that the employee whose social security number is SSN works HOURS per week on the project whose name, number, and location are PNAME, PNUMBER, and PLOCATION. Suppose that we used EMP_PROJ1 and ...
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Investigations on Methods Developed for Effective Discovery of Functional Dependencies
... INFERRING FUNCTIONAL DEPENDENCIES In this paper, the author stated that the dependency inference problem is to identify a cover for the set of FDs which hold in a given ...relational database ...
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Propagating Functional Dependencies with Conditions
... The construction of tableau T e i follows the same way as that of T V given in the proof of Theorem 3.1. Without loss of generality, we assume that there is a total order ≤ on the variables in T e i . Variables in T e i ...
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Functional Dependencies and Finding a Minimal Cover
... the database, we eliminated the transitive dependency by splitting the Pay(Employee, Grade, Salary) table into two separate ta- bles: Pay(Employee, ...the database be- comes larger and more complex, and the ...
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Normal Forms & Functional Dependencies (II)
... ➢If gain/loose fields ➢If Course Title is not unique • What if there was another Database Systems course taught by another school? If Course Title was not unique then the tables, when joined back together, might ...
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Possibilistic functional dependencies and their relationship to possibility theory
... in database practice. Indeed, the lay- ered view of the database together with the different levels of certainty of the FDs suggest their use in the control of the de- composition process of relations in ...
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A Survey on Strategies Developed for Mining Functional Dependencies
... DISCOVERY FUNCTIONAL AND APPROXIMATE DEPENDENCIES In this paper, the author defines about the discovery of FDs, which uses an important database analysis technique called TANE, an efficient algorithm ...
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