Results 301 to 310 of about 1,690,986 (339)

A Method for Rough Relational Database Transformed into Relational Database

2009 IITA International Conference on Services Science, Management and Engineering, 2009
It is decomposed the data of rough relational database and transformed into relational database according to the characteristic of rough relational database and relational database and in virtue of multiplication principle and Descartes of basic operation of relational algebra. Then deleted redundant data and optimized RDB.
Wei Zhang, Ling-ling Wei
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Bubbles for relational database

ACM SIGARCH Computer Architecture News, 1978
The mechanical disk storage is limited by long initial delay, few inputs/outputs, and serial access, thus necessitating large complex programs in existing database systems in order to map the user's view into the physical storage and to provide different access paths in response to different queries.
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Independence in Database Relations

2013
We investigate the implication problem for independence atoms X⊥Y of disjoint attribute sets X and Y on database schemata. A relation satisfies X⊥Y if for every X-value and every Y-value that occurs in the relation there is some tuple in the relation in which the X-value occurs together with the Y-value.
Kontinen, J., Link, S., Väänänen, J.
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Construction of relations in relational databases

ACM Transactions on Database Systems, 1980
Using a nonprocedural language for query formulation requires certain automatization of a query answering process. Given a query for creation of a new relation, the problem is to find an efficient procedure which produces this relation from a given relational database. We concentrate upon sequences of join operations which losslessly produce a relation
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Relational Databases with Ordered Relations

Logic Journal of the IGPL, 2005
Summary: The paper deals with expressing preferences in the framework of the relational data model. Preferences have usually a form of a partial ordering. Therefore the question arises how to provide the relational data model with such an ordering.
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Relations and Databases [PDF]

open access: possible, 2013
In mathematics a binary relation between two sets \(A\) and \(B\) is a collection of ordered pairs \((a,b)\) belonging to the cartesian product \(A\,\times \,B\). In this chapter we present some of the general properties of relations and their operations, as well some special types of relations defined over the same set.
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The use of a database machine for supporting relational databases

ACM SIGARCH Computer Architecture News, 1978
One of the goals in the design of database machines of the future is their generality. In addition to being capable of carrying out the common database management functions with high reliability and performance, some of these machines are intended to support more than one data model. A specific database machine, known as the DBC, is intended to support
Jayanta Banerjee, David K. Hsiao
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On similarity relations in fuzzy relational databases

Fuzzy Sets and Systems, 1984
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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