The term is used in Date's well-known database textbook An Introduction to Database Systems to differentiate between a variable that contains a relation and the relation itself.

In database systems, a propagation constraint " details what should happen to a related table when we update a row or rows of a target table " ( Paul Beynon-Davies, 2004, p. 108 ).

To meet such requirement effectively database architecture consists of three levels: external, conceptual and internal.

Clearly separating the three levels was a major feature of the relational database model implementations that dominate 21st century databases.

All the three levels are maintained and updated according to changing needs by database administrators who often also participate in the database design.

A design is typically carried out according to the common three architectural levels of a database ( see Database architecture above ).

A DBMS minimizes these problems by providing three views of the database data: an external view ( or user view ), logical view ( or conceptual view ) and physical ( or internal ) view.

While it is true that a workbook that contains three sheets is indeed a file containing multiple tables that can interact with each other, it lacks the relational structure of a database.

In a reified RDF database, each original statement, being a resource, itself, most likely has at least three additional statements made about it: one to assert that its subject is some resource, one to assert that its predicate is some resource, and one to assert that its object is some resource or literal.

The name referred to the three ways the product could be used: as a spreadsheet, a graphics package, and a database manager.

The name referred to the three ways the product could be used, as a spreadsheet, graphics package, and database manager.

In 1993, the US National Science Foundation, after a competitive bidding process in 1992, created the Internet Network Information Center, known as InterNIC, to manage the allocations of addresses and awarded the contract to three organizations: Network Solutions provided registration services, AT & T provided directory and database services, and General Atomics provided information services.

Jet combined three primary subsystems ; an ISAM-based database engine ( often and confusingly also known as " Jet "), a C-based interface allowing applications to access that data, and a selection of driver DLLs that allowed the same C interface to redirect input and output to other ISAM-based databases, like Paradox and xBase.

Of the all-time most referenced papers in physics and astronomy in the SPIRES database, only three have been published since 2000, and all three are WMAP publications.

If the column headings in a relational database table are divided into three disjoint groupings X, Y, and Z, then, in the context of a particular row, we can refer to the data beneath each group of headings as x, y, and z respectively.

* If a requirement exists to do insertions, updates, or deletions, find out which rows should be processed in which way in the ETL layer, and then process these three operations in the database separately.

In August 1959, Chinese troops captured an Indian outpost at Longju, three miles south of the McMahon Line according to the Geonames database ( National Geospatial-Intelligence Agency ).

It has sometimes been said that in some reference works flory-counter-flory ( and flory ) is treated like a line of partition, even though strictly speaking it is not-though it has been used for centuries that way in the royal arms of Scotland blazoning the double tressure ( Public Register of Arms, Lyon Court, Edinburgh ) and used by the College of arms in blazoning coats like that of Sutherland of Dunstanburgh Castle ( Gules, a chevron flory-counterflory between in chief three mullets and in base a lymphad all or ) and is used by the South African Bureau of Heraldry blazoning the coat of Huis Tankotie of the University of Pretoria ( Per fess, flory counter-flory, Argent and Azure, in base within the flower an annulet Sable ; a bordure counterchanged ) and Emmanuel-Opleidingsentrum in the South African Bureau of Heraldry's online database.

Published three times a year by the Communications Service, this magazine is distributed free to everyone in the central graduate database and to staff as well as friends of the institution.

The company also hosts three biomedical databases: Cases Database, a database of medical case reports ; Current Controlled Trials, a database of clinical trials ; and Biology Image Library.

The GRIN database lists three species: Retama raetam, Retama monosperma, and Retama sphaerocarpa.

The database used for the homepage was a backup taken on March 10, 2004 ( the day of ShareReactor ’ s closure ), and the forum database was from a backup taken on December 29, 2002 ( about one year and three months prior to the closure ).

Each individual actually has three credit scores for the FICO scoring model because the three national credit bureaus, Experian, Equifax and TransUnion, each has its own database.

A variety of these ways have been tried for storing objects in a database.

Data typically reside in the storage in structures that look completely different from the way the data look in the conceptual and external levels, but in ways that attempt to optimize ( the best possible ) these levels ' reconstruction when needed by users and programs, as well as for computing additional types of needed information from the data ( e. g., when querying the database ).

Since database structures are complex, in most cases, and especially for not-very-simple queries, the needed data for a query can be collected from a database by accessing it in different ways, through different data-structures, and in different orders.

Data typically reside in the storage in structures that look completely different from the way the data look in the conceptual and external levels, but in ways that attempt to optimize ( the best possible ) these levels ' reconstruction when needed by users and programs, as well as for computing additional types of needed information from the data ( e. g., when querying the database ).

Since database structures are complex, in most cases, and especially for not-very-simple queries, the needed data for a query can be collected from a database by accessing it in different ways, through different data-structures, and in different orders.

One of the ways to do this is by comparing selected facial features from the image and a facial database.

Using the MeSH database to define the subject of interest is one of the most useful ways to improve the quality of a search.

* QUEL is a relational database access language, similar in most ways to SQL ;

One of the ways to do this is by comparing selected facial features from the image and a facial database.

Music database Allmusic stated " these newer bands, termed post-hardcore, often found complex and dynamic ways of blowing off steam that generally went outside the strict hardcore realm of ' loud fast rules '.

There are two ways to address this problem: one is to make the server computationally bounded and the other is to assume that there are multiple non-cooperating servers, each having a copy of the database.

The Nintendo DS game Scribblenauts allows the player to write the name of tens of thousands of nouns within its database to bring that object into a game's level and have it behave realistically within the game's engine ; the game challenges the player to find as many ways to complete puzzles or reach a goal by using such objects in any combination, and is considered by its developers 5TH Cell to promote emergent gameplay.

PowerBuilder supports the following ways of interacting with a database:

C-Store differs from most traditional relational database management system ( RDBMS ) designs in many ways, perhaps most notably in that it stores data by column and not by row, optimizing the database for reading of data rather than writing.

In many ways working like a database journal, many filesystems have the ability to journal their activity.

Alternate terms include " hybrid database ", " Object-enhanced RDBMS " and others.

MySQL ( " My S-Q-L ", officially, but also called " My Sequel ") is the world's most used open source relational database management system ( RDBMS ) as of 2008 that runs as a server providing multi-user access to a number of databases.

Typically, the user interface runs on a desktop PC or workstation and uses a standard graphical user interface, functional process logic may consist of one or more separate modules running on a workstation or application server, and an RDBMS on a database server or mainframe contains the computer data storage logic.

# A back-end database or data store, comprising both data sets and the database management system or RDBMS software that manages and provides access to the data.

Ellison took inspiration from the 1970 paper written by Edgar F. Codd on relational database management systems ( RDBMS ) named " A Relational Model of Data for Large Shared Data Banks.

The software used in a relational database is called a relational database management system ( RDBMS ).

* The PostgreSQL RDBMS that uses zlib with custom dump format ( pg_dump-Fc ) for database backups.

IBM Informix is a product family within IBM's Information Management division that is centered on several relational database management system ( RDBMS ) offerings.

A relational database management system ( RDBMS ) is a database management system ( DBMS ) that is based on the relational model as introduced by E. F. Codd, of IBM's San Jose Research Laboratory.

* IBM Informix Dynamic Server, a relational database management system ( RDBMS ) sold by IBM

* Temporal or versioned data to understand system and business times at the database level ( Bi-temporal feature is not available on Oracle or any other competing RDBMS products )

: See Linter SQL RDBMS for the database system, Lint ( software ) for the static code analysis tool, and Linter Group for the Australian textiles company.

Teradata is an enterprise software company that develops and sells a relational database management system ( RDBMS ) with the same name.

InterBase is a relational database management system ( RDBMS ) currently developed and marketed by Embarcadero Technologies.

Together, they set out to create a relational database management system ( RDBMS ), which would organize information and make it available to many computers in a network.

When Sybase launched its mobility subsidiary, Sybase iAnywhere, in 2000, SQL Anywhere became its flagship relational database management system ( RDBMS ) and helped the company to become the leader of the mobile database market.

Whereas SQL retrieves data sets from a relational database ( RDBMS ), with dBase one can more easily manipulate, format, analyze and perform calculations on individual records, strings, numbers, and so on in a step-by-step imperative ( procedural ) way instead of trying to figure out how to use SQL's declarative operations.

Employing organizations may require that a database administrator have a certification for the particular RDBMS being used.

The Oracle Database ( commonly referred to as Oracle RDBMS or simply as Oracle ) is an object-relational database management system ( ORDBMS ) produced and marketed by Oracle Corporation.

The Oracle RDBMS typically relies on a group of processes running simultaneously in the background and interacting to monitor and expedite database operations.

to binary large object ( BLOB ) data stored directly in a relational database management system ( RDBMS ) similar to other vector-based feature classes.