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Topic: Relational database


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In the News (Mon 17 Dec 18)

  
  Site Map for Relational Database Management Systems
Database Administration in New Zealand - RDBMS DBAs
Database Administration in the United Kingdom - RDBMS DBA Jobs
Database Administration Jobs in the United States - RDBMS DBAs
rdbms.ca /resources/sitemap.html   (116 words)

  
  Relational database - Wikipedia, the free encyclopedia
A relational database is a database structured in accordance with the relational model.
The relational algebra is complete with respect to first-order predicate calculus except that restrictions are imposed on the use of the logical operations of negation and disjunction in order to guarantee that database computations will be feasible in practice.
The relational algebra is a set of operations that manipulate relations as they are defined in the relational model and as such describes part of the data manipulation aspect of this data model.
en.wikipedia.org /wiki/Relational_database   (577 words)

  
 Relational model - Wikipedia, the free encyclopedia
The relational model depends on the law of excluded middle under which anything that is not true is false and anything that is not false is true; it also requires every tuple in a relation body to have a value for every attribute of that relation.
Database normalization is usually performed when designing a relational database, to improve the logical consistency of the database design and the transactional performance.
Usually in the relational model a database schema is said to consist of a set of relation names, the headers that are associated with these names and the constraints that should hold for every instance of the database schema.
en.wikipedia.org /wiki/Relational_model   (2799 words)

  
 Relational database management system - Wikipedia, the free encyclopedia
The most popular definition of an RDBMS is imprecise and not strictly based on relational theory; some argue that merely presenting a view of data as a collection of rows and columns is sufficient to qualify as an RDBMS.
A second, theory-based school of thought argues that if a database does not implement all of Codd's rules (or the current understanding on the relational model, as expressed by Christopher J Date, Hugh Darwen and others), it is not relational.
Database Debunkings - Critical point of view that argues that it is important that the predicate relational should be reserved for those database systems that are fully faithful to the relational model.
en.wikipedia.org /wiki/Relational_database_management_system   (493 words)

  
 Howstuffworks "What are relational databases?"
In fact, the relational database was born in 1970 when E.F. Codd, a researcher at IBM, wrote a paper outlining the process.
In the relational database example, you can quickly compare salaries and ages because of the arrangement of data in columns.
Relational databases are created using a special programming language, structured query language (SQL), that is the standard for database interoperability.
computer.howstuffworks.com /question599.htm   (479 words)

  
 The CTDP Basic Database Guide - RDBMS Definition
Relational databases store data in tables (relations) that are two dimensional.
A relational database server is not the same as a relational database.
Relational database servers use Structured Query Language (SQL), as a data manipulation language to interface between itself and the clients.
www.comptechdoc.org /independent/database/basicdb/datardbms.html   (576 words)

  
 Fundamentals of Relational Database Design -- r937.com
The relational model can also be applied to the design of databases, which is the subject of the remainder of this article.
Two tables are related in a one-to-many (1—M) relationship if for every row in the first table, there can be zero, one, or many rows in the second table, but for every row in the second table there is exactly one row in the first table.
The relational model defines several integrity rules that, while not part of the definition of the Normal Forms are nonetheless a necessary part of any relational database.
r937.com /relational.html   (6723 words)

  
 RFC 1697 (rfc1697) - Relational Database Management System (RDBMS) Managem   (Site not responding. Last check: )
Databases are collections of interrelated data organized according to a schema to serve one or more applications.
A database is, for purposes of this MIB, a collection of tables whose organization is based on the relational model.
Relational Database Management System (RDBMS) A collection of integrated services which support database management and together support and control the creation, use and maintenance of relational databases.
www.faqs.org /rfcs/rfc1697.html   (4097 words)

  
 oreilly.com -- Online Catalog: Database in Depth
This book sheds light on the principles behind the relational model, which is fundamental to all database-backed applications--and, consequently, most of the work that goes on in the computing world today.
Virtually everyone who deals with relational databases should have at least a passing understanding of the fundamentals of working with relational models.
Database In Depth is even better than I expected, since he incorporated concepts from Third Manifesto as well.
www.oreilly.com /catalog/databaseid   (955 words)

  
 Database Models: Hierarcical, Network, Relational, Object-Oriented, Semistructured, Associative and Context.
In contrast to a relational DBMS where a complex data structure must be flattened out to fit into tables or joined together from those tables to form the in-memory structure, object DBMSs have no performance overhead to store or retrieve a web or hierarchy of interrelated objects.
In such database there is no clear separation between the data and the schema, and the degree to which it is structured depends on the application.
Such databases subsume the modelling power of recent extensions of flat relational databases, to nested databases which allow the nesting (or encapsulation) of entities, and to object databases which, in addition, allow cyclic references between objects.
unixspace.com /context/databases.html   (2376 words)

  
 Web Application Development, Winter 2006   (Site not responding. Last check: )
Logically, relational databases lend themselves very efficiently to many situations, and because their structure is transparent, they can be designed and modified relatively easily.
If, when a relational database is created, the RDBMS is notified which fields in which tables are primary keys and which fields in which tables they then appear in as foreign keys (i.e.
The most important, and arguably the hardest, part of building a database is figuring out, exactly, what data need to be included, how they should be organized, and how they inter-relate, then crafting a design around those data that efficiently solves the problem for which the database was initially conceived.
gradcenter.marlboro.edu /~iank/wad/2   (2940 words)

  
 Chapter 6: The Rise of Relational Databases | Funding a Revolution: Government Support for Computing Research
For instance, although the relational model was originally proposed and developed at IBM, it was a government-funded effort at the University of California at Berkeley (UC-Berkeley) that disseminated the idea widely and gave it the intellectual legitimacy required for broad acceptance and commercialization.
The term "database" emerged to capture the sense that the information stored within a computer could be conceptualized, structured, and manipulated independently of the specific machine on which it resided.
Related research in information retrieval, multimedia, scientific databases, and digital libraries is under way, supported by DARPA, NSF, and the National Library of Medicine, among others.
www.nap.edu /readingroom/books/far/ch6.html   (3609 words)

  
 Relational Database Design - Course 382   (Site not responding. Last check: )
To efficiently use a database, knowledge of the architecture and of the SQL programming language is essential.
This course provides a comprehensive foundation for designing, building, and working with relational databases, enabling you to understand and participate in the development process and use a relational database effectively.
This course is valuable for anyone involved in building and using relational databases and implementing database applications.
www.learningtree.com /courses/382.htm   (442 words)

  
 15 Seconds : Introduction to Relational Databases - Part 1: Theoretical Foundation
The concept of relational databases was first described by Edgar Frank Codd (almost exclusively referenced as E. Codd in technical literature) in the IBM research report RJ599, dated August 19th, 1969.
The database description is represented at the logical level in the same way as ordinary data, so authorized users can apply the same relational language to its interrogation as they apply to regular data.
If a relational system has or supports a low-level (single-record-at-a-time) language, that low-level language cannot be used to subvert or bypass the integrity rules or constraints expressed in the higher-level (multiple-records-at-a-time) relational language.
www.15seconds.com /issue/020522.htm   (3641 words)

  
 Dilip's Brief Introduction to Relational Databases
The Select (no relation to the relational algebra operation) statement is probably the most widely used SQL statement, and it is used to retrieve data from a database.
The relational model of databases provides a very simple way of looking at data structured into tables, and there are straightforward techniques, such as ER modeling (though we didn't map the ER to the relational model) to represent a world view from which to build a relational database.
We looked at the set theoretic relational algebra that relational databases are based on, and considered the high-level SQL language for users to declaratively specify queries to retrieve information from databases.
www.cs.unc.edu /Courses/wwwp-s98/members/barman/databaseLesson   (2870 words)

  
 What is RDBMS? - A Word Definition From the Webopedia Computer Dictionary
Short for relational database management system and pronounced as separate letters, a type of database management system (DBMS) that stores data in the form of related tables.
Relational databases are powerful because they require few assumptions about how data is related or how it will be extracted from the database.
This differs from flat-file databases, in which each database is self-contained in a single table.
www.webopedia.com /TERM/R/RDBMS.html   (205 words)

  
 XQuery in Relational Database Systems
Relational database systems have embraced XML in many different ways over the last couple of years.
First generation XML support in relational database systems mainly concerned themselves with exporting relational data as XML, where the markup was communicating structural and semantic information, and to import relational data in XML markup form back into a relational representation.
Most relational database systems, such as SQL Server 2005, and the SQL standard are busy adding XQuery support to their XML data type.
www.idealliance.org /proceedings/xml04/papers/254/XQueryRDS.html   (3594 words)

  
 WDVL: Relational Databases
Of course in the 80's the "Relational Database Model" became the rage.
At the core of the relational model is the concept of a table (also called a relation) in which all data is stored.
This is quite a bit different from the hierarchical and network models in which the user had to have an understanding of how the data was structured within the database in order to retrieve, insert, update, or delete records from the database.
wdvl.com /Authoring/DB/Intro/relational_databases.html   (649 words)

  
 Jan's Computer Basics:2-4 Databases   (Site not responding. Last check: )
database is a collection of data that you want to manage, rearrange, and add to later.
Using a well-designed relational database can greatly reduce the amount of data you must enter each time you add a record.
In a flat database you would have to have a record for each agent for every company and state he is licensed with, repeating the agent info for each record.
www.jegsworks.com /Lessons/lesson1-2/lesson2-4database.htm   (760 words)

  
 Your First Database
Even experienced database administrators have been known to discover, halfway into a project, that their data design is flawed and they have no choice but to throw out all the code they've written so far and start from scratch.
As you tackle your first database, be prepared to make some mistakes.
You need the practice because relational database design is difficult conceptually and even harder practically.
www.webmonkey.com /99/13/index1a.html   (320 words)

  
 Windows Database Service: Introduction to Data Modeling   (Site not responding. Last check: )
It is intended for someone who is familiar with relational databases but who has no experience in data modeling.
The basic techniques described are applicable to the development of microcomputer based relational database applications as well as those who use relational database servers such as MS SQL Server or Oracle.
The document is a practical guide, not an academic paper on either relational database design or data modeling.
www.utexas.edu /its/windows/database/datamodeling   (141 words)

  
 What is database? - A Word Definition From the Webopedia Computer Dictionary
Traditional databases are organized by fields, records, and files.
In a Hypertext database, any object, whether it be a piece of text, a picture, or a film, can be linked to any other object.
Hypertext databases are particularly useful for organizing large amounts of disparate information, but they are not designed for numerical analysis.
www.webopedia.com /TERM/d/database.html   (492 words)

  
 Firebird - Relational Database for the New Millenium   (Site not responding. Last check: )
Firebird - Relational Database for the New Millenium
Firebird is a relational database offering many ANSI SQL standard features that runs on Linux, Windows, and a variety of Unix platforms.
Firebird is a commercially independent project of C and C++ programmers, technical advisors and supporters developing and enhancing a multi-platform relational database management system based on the source code released by Inprise Corp (now known as Borland Software Corp) on 25 July, 2000 under the InterBase Public License v.1.0.
firebird.sourceforge.net   (529 words)

  
 Java Skyline: Database
Defines a style of DDL where database objects all have object IDs and there is a Factory classes structure that store/restore information to/from database.
Database access without coding SQL or major source code changes; implements vast majority of JDO final spec - including query filters and maps supports JDBC 1.x, 2, JBoss, WebLogic, a number of RDBMSs.
JCDatabase is a simple relational database server and interface that you can use from Java.
www.javaskyline.com /database.html   (2410 words)

  
 RDBMS - Relational Database Management Systems
This material may prove useful to you in better understanding the nature of relational databases.
Some databases are little more than a light layer of syntactic frosting on top of a flat file storage system.
in their names are hardly relational in nature.
www.cbbrowne.com /info/rdbms.html   (568 words)

  
 MySQL AB :: Guide to Choosing an Embedded Relational Database
MySQL is the most popular database for ISVs, VARs, hardware vendors, and network appliance manufactures who want to cost-effectively embed or bundle a reliable, high-performance relational database.
Win competitive comparisons using a database that has earned respect for its superior performance and reliability.
To help you better understand the issues surrounding embedding a relational database, MySQL has developed this Guide to Choosing an Embedded Relational Database.
www.mysql.com /why-mysql/white-papers/embedded.php   (161 words)

  
 Duro - open-source relational database library   (Site not responding. Last check: )
Duro is a relational open-source database library written in C. It is based on the principles laid down in the book
The goal of the Duro project is to create a library which is as compliant with the proposed database language D as it is possible for a C library.
This library is supposed to serve as a basis for a truly relational database management system (TRDBMS).
duro.sourceforge.net   (186 words)

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