Results 131 to 140 of about 626,884 (187)

An extension of classical functional dependency: dynamic fuzzy functional dependency

Information Sciences, 1999
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Ben Yahia, S., Ounalli, H., Jaoua, A.
openaire   +4 more sources

Preserving Functional Dependencies

SIAM Journal on Computing, 1981
We show that functional dependency preservation can be tested in polynomial time. We show further that while finding a cover for all embedded dependencies is NP-complete, such a cover can be found in polynomial time if dependencies are preserved.
Beeri, C., Honeyman, P.
openaire   +2 more sources

Rationally Functional Dependence

Journal of Philosophical Logic, 2013
The authors discuss functional dependencies, and compare ontological and rational dependencies. What I call ontological dependencies are the dependencies that are based on the state of nature. Rational dependencies, on the other hand, are game theoretical, and require a free will and a strategy-based approach.
Naumov, Pavel, Nicholls, Brittany
openaire   +3 more sources

Functional equations involving Sibuya’s dependence function

Aequationes mathematicae, 2018
The authors consider the problem of solving the functional equation \(D_{\mathbf X}(x_1,x_2)=D_{{\mathbf X}_{(t_1,t_2)}}(x_1,x_2)\) for all \(x_1\), \(x_2\), \(t_1\), \(t_2\geq 0\), where \(D_{\mathbf X}(x_1,x_2)\) is the Sibuya's dependence function and \(\mathbf X\) and \({\mathbf X}_{(t_1,t_2)}\) are random vectors defined as \({\mathbf X}=(X_1,X_2)\
Nikolai Kolev, Jayme Pinto
openaire   +1 more source

Local XML functional dependencies

Proceedings of the fifth ACM international workshop on Web information and data management - WIDM '03, 2003
Keys and functional dependencies play a fundamental role in relational databases where they are used in integrity enforcement and in database design. Similarly, these constraints will play a fundamental role in XML and recently keys and functional dependencies in XML have been defined.
Jixue Liu, Millist Vincent, Chengfei Liu
openaire   +2 more sources

Error-Robust Functional Dependencies

Fundamenta Informaticae, 2004
A database user may be confronted with a relation that contains errors. These errors may result from transmission through a noisy channel, or they may have been added deliberately in order to hide or spoil information. Error-robust functional dependencies provide dependencies that still hold in the case of errors.
Hartmann, Sven, Link, Sebastian, Schewe, Klaus-Dieter, Thalheim, Bernhard   +3 more
openaire   +2 more sources