Relational model - Wikipedia, the free encyclopedia
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The relational model for database management is a database model based on first-order predicate logic, first formulated and proposed in 1969 by E.F. Codd. Its core idea is to describe a database as ...
en.wikipedia.org/wiki/Relational_model
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Relational database - Wikipedia, the free encyclopedia
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A relational database matches data using common characteristics found within the data set. The resulting groups of data are organized and are much easier for people to understand. For example, a dat...
en.wikipedia.org/wiki/Relational_database
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Because these relationships are only specified at retreival time, relational databases are classed as dynamic database management system. The RELATIONAL database model is based on the Relational Algebra.
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www.unixspace.com/context/databases.html
www.unixspace.com/context/databases.html
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The relational model is the most popular type of database and an extremely powerful tool, not only to store information, but to access it as well. Relational databases are organized as tables. The beauty of a table is that the information can be accessed or added without reorganizing the tables.
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www.tech-faq.com/database.shtml
www.tech-faq.com/database.shtml
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The relational model for database management: version 2 ... In developing the relational model, I have tried to follow Einstein's advice, "Make it as simple as possible, but no simpler." I believe that in the last clause he ... Codd, E. F. (1987e) View Updatability in Relational Databases: Algorithm VU-1. Unpublished paper.
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portal.acm.org/citation.cfm?id=77708
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This is the first of a two-part article that will provide an introduction to relational databases and the SQL language. This first part describes some of the key elements of the technology with an emphasis on database normalization. ... Dynamic Online Catalog Based on the Relational Model; The database description...
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www.15seconds.com/issue/020522.htm
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This page defines 'relational database' and relates it to similar terms. ... A relational database is a collection of data items organized as a set of formally-described tables from which data can be accessed or reassembled in many different ways without having to reorganize the database tables.
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www.digitale.it/lezione/database/whatis/relation.htm
www.digitale.it/lezione/database/whatis/relation.htm
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Actually, most non-relational databases are based on some "navigational" model: an hierarchy, a linked list, a B-Tree, etc. It's common to refer to these as ISAM (Indexed Sequential Access Method) Databases.
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www.edm2.com/0612/msql7.html
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The basic principle of the relational model is the Information Principle: all information is represented by data values in relations. ... Hierarchical and network databases existed before relational databases, but were only described as models after the relational model was defined, in order to establish a basis for comparison.
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www.lycos.com/info/relational-model--databases.html
www.lycos.com/info/relational-model--databases.html
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