relational algebra

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relational algebra

(database, theory)
A family of algebra with a well-founded semantics used for modelling the data stored in relational databases, and defining queries on it. The main operations of the relational algebra are the set operations (such as union, intersection, and cartesian product), selection (keeping only some lines of a table) and the projection (keeping only some columns).

The relational data model describes how the data is structured.

Codd's reduction algorithm can convert from relational calculus to relational algebra.

relational algebra

(1) The branch of mathematics that deals with relations; for example, AND, OR, NOT, IS and CONTAINS.

(2) In a relational database, a collection of rules for dealing with tables; for example, JOIN, UNION and INTERSECT.
References in periodicals archive ?
R), the Dynamic O/R Mapping(TM) company, architects of CocoBase(R) Enterprise O/R, was formed in 1993, and subsequently revolutionized Object to Relational Mapping technology with landmark solutions and industry leadership.
CocoBase Enterprise O/R is a vendor neutral Dynamic Object to Relational Mapping layer that sits on top of the JDBC driver between the application objects (often running in an application server or stand-alone) and the database (which is usually a relational database for most modern IT organizations).
The advances in technology also increase the opportunities for relational aggression.
Active archiving provides a "best practice" strategy for managing relational database growth.
To do this, helping professionals will need to have a basic understanding of healing traditions presented here as a relational worldview.
The functional, relational records retention schedule gets its name from two main features of the methodology:
If you got your relational data base right, you could answer any question, including, "Tell me the number of left-handed salesmen in Minneapolis who speak Greek.
The Seamark relational navigation engine uses metadata facets to guide users to relevant content, generating unique views into the available assets based on a user's navigation.
Striva's DETAIL(TM) data integration platform provides transparent access to relational and non-relational data spread across many different types of platforms, operating systems and databases, providing enterprises with a single, scalable solution to power the Real-Time Enterprise.
NB: My ideas about relational aesthetics started from observing a group of artists--Rirkrit Tiravanija, Maurizio Cattelan, Philippe Parreno, Pierre Huyghe, Vanessa Beecroft.
Relational database software, however, easily stores and retrieves sets of related records within complex data sets, such as separate (but related) files about people, bank accounts, and their financial status.
20 /PRNewswire/ -- Two leading software vendors have announced products that implement Distributed Relational Database Architecture(A) (DRDA)(A), IBM's (NYSE: IBM) architecture for accessing distributed relational data, while others have announced their intention to deliver products that implement DRDA.

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