[BOOK][B] Decision Support System: Tools and Techniques
S Bandyopadhyay - 2023 - taylorfrancis.com
This book presents different tools and techniques used for Decision Support Systems (DSS),
including decision tree and table, and their modifications, multi-criteria decision analysis …
including decision tree and table, and their modifications, multi-criteria decision analysis …
The implication problem of data dependencies over SQL table definitions: axiomatic, algorithmic and logical characterizations
We investigate the implication problem for classes of data dependencies over SQL table
definitions. Under Zaniolo's “no information” interpretation of null markers we establish an …
definitions. Under Zaniolo's “no information” interpretation of null markers we establish an …
Design by example for SQL table definitions with functional dependencies
A database is C-Armstrong for a given set of constraints in a class C if it satisfies every
constraint of the set and violates every constraint in C not implied by the set. Therefore …
constraint of the set and violates every constraint in C not implied by the set. Therefore …
Efficient reasoning about a robust XML key fragment
We review key constraints in the context of XML as introduced by Buneman et al. We
demonstrate that:(1) one of the proposed inference rules is not sound in general, and (2) the …
demonstrate that:(1) one of the proposed inference rules is not sound in general, and (2) the …
Empirical evidence for the usefulness of Armstrong relations in the acquisition of meaningful functional dependencies
WD Langeveldt, S Link - Information Systems, 2010 - Elsevier
Armstrong relations satisfy precisely those data dependencies that are implied by a given
set of data dependencies. A common perception is that Armstrong relations are useful in the …
set of data dependencies. A common perception is that Armstrong relations are useful in the …
On Codd families of keys over incomplete relations
Keys allow a database management system to uniquely identify tuples in a database.
Consequently, the class of keys is of great significance for almost all data processing tasks …
Consequently, the class of keys is of great significance for almost all data processing tasks …
Possibilistic functional dependencies and their relationship to possibility theory
This paper introduces possibilistic functional dependencies. These dependencies are
associated with a particular possibility distribution over possible worlds of a classical …
associated with a particular possibility distribution over possible worlds of a classical …
Characterisations of multivalued dependency implication over undetermined universes
S Link - Journal of Computer and System Sciences, 2012 - Elsevier
In relational databases the original definition of a multivalued dependency is dependent on
the underlying relation schema. In this context, the implication of multivalued dependencies …
the underlying relation schema. In this context, the implication of multivalued dependencies …
Numerical constraints on XML data
Boundaries occur naturally in everyday life. This paper introduces numerical constraints into
the framework of XML to take advantage of the benefits that result from the explicit …
the framework of XML to take advantage of the benefits that result from the explicit …
When data dependencies over SQL tables meet the Logics of Paradox and S-3
We study functional and multivalued dependencies over SQL tables with NOT NULL
constraints. Under a no-information interpretation of null values we develop tools for …
constraints. Under a no-information interpretation of null values we develop tools for …