Type 2 approximate functional dependency and the outliers with functional dependency.

نویسندگان
چکیده

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Improving Query Evaluation with Approximate Functional Dependency Based Decompositions

We investigate how relational restructuring may be used to improve query performance. Our approach parallels recent research extending semantic query optimization (SQO), which uses knowledge about the instance to achieve more e cient query processing. Our approach di ers, however, in that the instance does not govern whether the optimization may be applied; rather, the instance governs whether ...

متن کامل

Fuzzy Functional Dependency and Its Application to Approximate Data Querying

I n this paper, we review a new definition of fuzzy functional dependency based on conditional probability and i ts application to approximate data reduction related to operation of projection in classical relational database in order to construct fuzzy integrity constraints [l]. W e introduce the concept of partial fuzzy functional dependency which expresses the fact that a given attribute X d...

متن کامل

Understanding Functional Dependency

In explaining functional dependency to students, I have noticed in texts a mixture of two types of elements: intensional (or psychological or meaning) and extensional (patterns of repetition in the data). In this chapter I examine whether it is possible to consider functional dependency, in particular, in second and third normal forms, solely on an extensional basis. The Microsoft Access Analyz...

متن کامل

Abstract Functional Dependency Structures

functional dependency structures Franti sek Mat u s Institute of Information Theory and Automation Czechoslovak Academy of Sciences Pod vodd arenskou v e z 4, 182 08 Prague Czechoslovakia Abstract The functional dependency (FD) structures known mainly from the database relationships theory are appeared to comprehend other kinds of dependencies among objects like functions, boolean or random var...

متن کامل

The concept of ‘functional dependency’

Introduction: In Europe the concepts of ‘functioning/disability’ and ‘autonomy/dependency’ deserve special interest from the point of view of medical ontology. While Functioning/Disability are concepts defined at the WHO International Classification of Functioning (ICF), the autonomy/dependency pair is not even mentioned at this classification system. Description: The Council of Europe has defi...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Journal of Computer Science and Cybernetics

سال: 2012

ISSN: 1813-9663,1813-9663

DOI: 10.15625/1813-9663/23/1/1117