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Set of tuples consisting of values indexed by attributes
In database theory, a relation, as originally defined by E. F. Codd, is a set of tuples (d1,d2,...,dn), where each element dj is a member of Dj, a data
Relation_(database)
Digital database whose organization is based on the relational model of data
papers, he defined what he meant by relation. One well-known definition of what constitutes a relational database system is composed of Codd's 12 rules
Relational_database
Organized collection of data in computing
In computing, a database is an organized collection of data or a type of data store based on the use of a database management system (DBMS), the software
Database
Database model
relational model. A table in a SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints
Relational_model
Set of data elements in databases
are less strict about column datatype definitions. Relation (database) Row (database) Column (database) Virtual column Table (information) "cell". Merriam-Webster
Table_(database)
Topics referred to by the same term
managing data Relation (database), a component of a relational database Relational algebra Relational calculus Relational database, a digital database Relationships
Relation
Reduction of data redundancy
introduced the sixth normal form (6NF) in 2003. Informally, a relational database relation is often described as "normalized" if it meets third normal form.
Database_normalization
Theory of relational databases
data are stored in the database) into a single output relation (the query results). Unary operators accept a single relation as input. Examples include
Relational_algebra
Concept in relational database design
database management systems, a unique key is a candidate key. All the candidate keys of a relation can uniquely identify the records of the relation,
Unique_key
Relationship between elements of two sets
In mathematics, a binary relation associates some elements of one set called the domain with some elements of another set (possibly the same) called the
Binary_relation
Relation with zero attributes
In mathematics, a nullary relation, 0-ary relation, or relation of degree zero is a relation with zero attributes. There are exactly two relations of degree
Nullary_relation
Cartesian product of mathematical fuzzy sets
A fuzzy relation is the cartesian product of mathematical fuzzy sets. Two fuzzy sets are taken as input, the fuzzy relation is then equal to the cross
Fuzzy_relation
Visual representation of database system relationships
overlapping elements specified in the input mapping is also in a database schema relation. Extended overlap preservation Source-specific elements that are
Database_schema
as a minimal exemplar of the interrelationships found in a database. The Supplier relation holds information about suppliers. The SID attribute identifies
Suppliers_and_Parts_database
Strategy used on previously-normalized databases
previously-normalized database to increase performance. In computing, denormalization is the process of trying to improve the read performance of a database, at the
Denormalization
Relative location of objects in space
A spatial relation specifies how some object is located in space in relation to some reference object. When the reference object is much bigger than the
Spatial_relation
Type of decomposition of a database relation
In database design, a lossless join decomposition is a decomposition of a relation r {\displaystyle r} into relations r 1 , r 2 {\displaystyle r_{1},r_{2}}
Lossless_join_decomposition
Candidate key with two or more attributes in a database
Semantic Web Relation Database terms of reference, Keys: An overview of the different types of keys in an RDBMS Different types of keys in a database: An overview
Composite_key
Database data model
database normalization, unnormalized form (UNF or 0NF), also known as an unnormalized relation or non-first normal form (N1NF or NF2), is a database data
Unnormalized_form
Level of database normalization
basic level of database normalization defined by English computer scientist Edgar F. Codd, the inventor of the relational database. A relation (or a table
First_normal_form
Overview of and topical guide to databases
(RDBMS) model: Relation – Table – Column – Row – View – Database transaction – Transaction log – history of actions executed by a database management system
Outline_of_databases
Property that assigns truth values to k-tuples of individuals
relation is called the arity, adicity or degree of the relation. A relation with n "places" is variously called an n-ary relation, an n-adic relation
Finitary_relation
Level of database normalization
normal form (3NF) is a level of database normalization defined by English computer scientist Edgar F. Codd. A relation (or table, in SQL) is in third normal
Third_normal_form
In relational databases, relvar is a term introduced by C. J. Date and Hugh Darwen as an abbreviation for relation variable in their 1995 paper The Third
Relvar
Vertices connected in pairs by edges
was first used in this sense by J. J. Sylvester in 1878 due to a direct relation between mathematics and chemical structure (what he called a chemico-graphical
Graph_(discrete_mathematics)
Set of columns in a relational database
design of database schema. The definition of candidate keys can be illustrated with the following (abstract) example. Consider a relation variable (relvar)
Candidate_key
Relational database theory concept
constraints over one relation (schema), whereas inclusion dependencies express constraints between relation schemas in a database schema. Furthermore,
Functional_dependency
American computer scientist (1946–1974)
he co-developed Structured Query Language (SQL) while managing the Relation Database development group for IBM in San Jose, California. He died on June
Raymond_F._Boyce
This is one of Helix's most unusual and powerful features. In the Relation, database tables (groups of related data) are created. Relations contain fields
Helix_(database)
Type of data model
tuples) and columns. Thus, the "relation" in "relational database" refers to the various tables in the database; a relation is a set of tuples. The columns
Database_model
American federal holiday in November
England, which were not feigned but true reports. Edward Winslow, in Mourt's Relation wrote: Our harvest being gotten in, our governor sent four men on fowling
Thanksgiving_(United_States)
Italian actress and filmmaker (born 1975)
calling for his release after Polanski was arrested in Switzerland in relation to his 1977 charge for drugging and raping a 13-year-old girl. In 2017
Asia_Argento
Term in relational and entity–relationship theory
relational database requires the implementation of a base relation (or base table) to resolve many-to-many relationships. A base relation representing
Associative_entity
Operation that restricts a relation to a specified set of attributes
{\displaystyle v} is an element of that attribute's domain — see Relation (database). The result of a projection Π a 1 , . . . , a n ( R ) {\displaystyle
Projection (relational algebra)
Projection_(relational_algebra)
Full constraint between two sets of attributes in a relation
In database theory, a multivalued dependency is a full constraint between two sets of attributes in a relation. In contrast to the functional dependency
Multivalued_dependency
Database theory
The universal relation assumption in relational databases states that one can place all data attributes into a (possibly very wide) table, which may then
Universal_relation_assumption
Type of unique key in a database
a type of unique key in a database formed of attributes that exist and are used in the external world outside the database (i.e. in the business domain
Natural_key
Database used to store info on hardware and software assets
A configuration management database (CMDB) is an ITIL term for a database used by an organization to store information about hardware and software assets
Configuration management database
Configuration_management_database
CC-inspired CCJP
within its database. The ruling looked at the meaning of the terms "extraction", "permanent transfer" and "temporary transfer" in relation to data, and
Database_Directive
Divisioning of a logical database
logical database or its constituent elements into distinct independent parts. Database partitioning refers to intentionally breaking a large database into
Partition_(database)
SQL toolkit and object-relational mapper
corresponding database tables in the DBMS: from sqlalchemy import * from sqlalchemy.ext.declarative import declarative_base from sqlalchemy.orm import relation, sessionmaker
SQLAlchemy
Type of database
relation of an incomplete database, described in the formalism of NULL values: There are infinitely many possible worlds for this incomplete database
Uncertain_database
Level of database normalization
normal form (2NF) is a level of database normalization defined by English computer scientist Edgar F. Codd. A relation (or a table, in SQL) is in 2NF if
Second_normal_form
Symbol representing the word "and" (&)
Ampersand is the name of a reactive programming language, which uses relation algebra to specify information systems. In SGML, XML, and HTML, the ampersand
Ampersand
Database using graph structures for queries
roughly the equivalent of a record, relation, or row in a relational database, or a document in a document-store database. Edges, also termed graphs or relationships
Graph_database
Where all data references are valid
valid. In the context of relational databases, it requires that if a value of one attribute (column) of a relation (table) references a value of another
Referential_integrity
Species of amphibian
catesbeianus (=Rana catesbeiana) (amphibian)". Global Invasive Species Database. Invasive Species Specialist Group. Retrieved 2013-01-20. "SAVE THE FROGS
American_bullfrog
Set of attributes that uniquely identifies each tuple of a relation
Introduction to Database Management Systems. Tata McGraw-Hill. 2005. p. 77. ISBN 9780070591196. no two tuples in any legal relation Saiedian, H. (1996-02-01)
Superkey
American photographer (born 1976)
mixed media, and visual presentation, particularly in fashion and its relation to identity. She is also known for dating actress Amber Heard. Van Ree
Tasya_van_Ree
Database model
the content. This implies that semantic databases can be integrated when they use the same (standard) relation types. This also implies that in general
Semantic_data_model
American comedian and actor (1949–1982)
on March 5, 1982, for possession of narcotics. This arrest was not in relation to Belushi's death. Later in 1982, Rolling Stone magazine described the
John_Belushi
Tree-like structure for data
A hierarchical database model is a data model in which the data is organized into a tree-like structure. The data are stored as records which is a collection
Hierarchical_database_model
Death of a region of brain cells due to poor blood flow
Barnett HJ (March 2004). "Endarterectomy for symptomatic carotid stenosis in relation to clinical subgroups and timing of surgery". Lancet. 363 (9413): 915–24
Stroke
1995 studio album by Cledus T. Judd
Cledus "T." Judd (No Relation) is the self-titled debut album of country music parodist Cledus T. Judd, and his first album for Razor & Tie after signing
Cledus_T._Judd_(No_Relation)
Art and technique of designing buildings
dealing with the aesthetic value of architecture, its semantics, and its relation to the development of culture. Many philosophers and theoreticians from
Architecture
Function of managing and maintaining DBMS software
Database administration is the function of managing and maintaining database management systems (DBMS) software. Mainstream DBMS software such as Oracle
Database_administration
Swedish filmmaker (1918–2007)
co-production, Autumn Sonata (Höstsonaten, 1978) starring Ingrid Bergman (no relation) and Liv Ullmann, and From the Life of the Marionettes (Aus dem Leben der
Ingmar_Bergman
American filmmaker (born 1943)
film director Roman Polanski, who had been arrested in Switzerland in relation to his 1977 charge for drugging and raping a 13-year-old girl. In January
Michael_Mann
Relationship between two sets, defined by a set of ordered pairs
a relation denotes some kind of relationship between two objects in a set, which may or may not hold. As an example, "is less than" is a relation on
Relation_(mathematics)
Normal form used in database normalization
NP-complete, given a database schema in third normal form, to determine whether it violates Boyce–Codd normal form. If a relation R is not in BCNF due
Boyce–Codd_normal_form
Data structure for query optimization in databases
A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage
Database_index
Bilateral relations
Canada, the United States imposed sanctions against Chinese officials in relation to the human rights violations in Xinjiang. The sanctions marked the first
China–United_States_relations
1666 autobiography by John Bunyan
Grace Abounding to the Chief of Sinners, or a Brief Relation of the Exceeding Mercy of God in Christ to his Poor Servant John Bunyan is a Puritan spiritual
Grace Abounding to the Chief of Sinners
Grace_Abounding_to_the_Chief_of_Sinners
Ownership of creative expressions and processes
identical or confusingly similar to a trademark owned by another party, in relation to products or services which are identical or similar to the products
Intellectual_property
Hunkpapa Lakota leader (1831–1890)
documentaries, which have reflected changing ideas about him and Lakota culture in relation to the United States. Among them are: Sitting Bull: The Hostile Sioux Indian
Sitting_Bull
Common viral infectious disease
doi:10.1056/NEJMbkrev39523. Henle G, Henle W, Diehl V (January 1968). "Relation of Burkitt's tumor-associated herpes-ytpe virus to infectious mononucleosis"
Infectious_mononucleosis
Physical fitness system
Leena (December 2011). "The Evolvement of the Pilates Method and its Relation to the Somatic Field". Nordic Journal of Dance. 2 (1): 56–69. "Joseph Pilates
Pilates
Scottish data scientist (born 1993)
deputy editor at Our World in Data. Her work focuses on sustainability, in relation to climate change, energy, food and agriculture, biodiversity, air pollution
Hannah_Ritchie
1988 studio album by Quiet Riot
Garza of the Los Angeles Times wrote: "This smoky, moody LP bears little relation to the bold, brash feel imparted by ex-frontman Kevin DuBrow. New singer
QR_(album)
1975 biography of H. P. Lovecraft by L. Sprague de Camp
Lovecraft: A Biography title listing at the Internet Speculative Fiction Database R.D. Mullen, "The Great Futilitarian: De Camp's Biography of Lovecraft
Lovecraft:_A_Biography
Predatory freshwater fish
Zambezi River, the population fluctuated markedly, apparently in direct relation to the abundance of the introduced clupeid Limnothrissa miodon which forms
Hydrocynus_vittatus
Four-part series of novels by Elena Ferrante (2011–2014)
and domestic violence. Isabelle Blank wrote about the complex, mirrored relation between the protagonists Lenu and Lila: "Lenù and Lila are foils for one
Neapolitan_Novels
Work by academic candidate
word dissertation can at times be used to describe a treatise without relation to obtaining an academic degree. The term thesis is also used to refer
Thesis
American scientist (1839–1914)
is a sign—not absolutely as itself, but instead in some relation or other. The sign relation is the key. It defines three roles encompassing (1) the sign
Charles_Sanders_Peirce
Measurement of tropical cyclone size
Previously, a database was created to determine ROCI values for the western north Pacific Ocean in 1972, using data from 1945 to 1968. Another database with additional
Radius of outermost closed isobar
Radius_of_outermost_closed_isobar
Horror film directed by Terence Fisher
Dracula films: "The stories as I've had them given to me have had almost no relation to the book...which is my reiterated complaint." "My one great regret has
Dracula_(1958_film)
1914 work by Vladimir Lenin
Lenin written in February–May 1914. It dealt with the national question in relation to countries such as Norway, Poland and Russia. A polemic against Rosa
The Right of Nations to Self-Determination
The_Right_of_Nations_to_Self-Determination
2006 studio album by Deftones
praise from fans and critics, with some of the latter applauding it in relation to the band's self-titled effort. In early 2004, Maverick Records informed
Saturday_Night_Wrist
One of the meanings of a word
senses" – Adam Kilgarriff (1997) – archive WordNet(R) – a large lexical database of English words and their meanings maintained by the Princeton Cognitive
Word_sense
Act of lengthening the labia minora
by Anderson and Iverson, who visited the Cape of Good Hope in 1644, in relation to the Khoisan of that region, but became extensively documented in the
Labia_stretching
Algorithm trading more space for lower time
resource – Aspect of computational complexity theory Savitch's theorem – Relation between deterministic and nondeterministic space complexity Hellman, Martin
Space–time_tradeoff
Open source browser engine
patches containing multiple changes with inadequate documentation, often in relation to future additions to the codebase. Thus, these patches were difficult
WebKit
Internet top-level domain generally used by or reserved for a country
Retrieved 2020-11-01. "IANA — Root Zone Database". iana.org. Retrieved 19 February 2023. "IANA — Root Zone Database". iana.org. Archived from the original
Country_code_top-level_domain
Large biological molecule that acts as a catalyst
classification: new options and contents in BRENDA". Nucleic Acids Research. 41 (Database issue): D764–D772. doi:10.1093/nar/gks1049. PMC 3531171. PMID 23203881
Enzyme
Violently rotating column of air
2008. Cook, Ashton Robinson; Schaefer, Joseph T. (22 January 2008). "The Relation of El Nino Southern Oscillation (ENSO) to Winter Tornado Outbreaks". 19th
Tornado
Psychoactive component of cannabis
December 2022. Pickens JT (April 1981). "Sedative activity of cannabis in relation to its delta'-trans-tetrahydrocannabinol and cannabidiol content". British
Tetrahydrocannabinol
Eurasian intergovernmental organisation
application, while one reservation was made by Azerbaijan on non-application in relation to Armenia and two specific opinions were expressed by Georgia and Ukraine
Commonwealth of Independent States
Commonwealth_of_Independent_States
Command in Unix-like operating systems
0000970225 696 697 985 0032959081 4059 4060 5741 join is intended to be a relation database operator. It is part of the X/Open Portability Guide since issue 2
Join_(Unix)
Topics referred to by the same term
Dependency relation, a type of binary relation in mathematics and computer science. Functional dependency, a relationship between database attributes
Dependency
Citrus fruit
Florida, as it hangs on trees in clusters resembling the grape, but has no relation to it whatever. Growers and shippers should drop the name 'grape-fruit'
Grapefruit
Essential nutrient found in citrus fruits and other foods
Block G, Levine M (April 1991). "Ascorbic acid: biologic functions and relation to cancer". Journal of the National Cancer Institute. 83 (8): 547–50. doi:10
Vitamin_C
Chemical element with atomic number 19 (K)
regulation in animals. Pergamon Press. Lans H', Stein IF, Meyer KA (1952). "The relation of serum potassium to erythrocyte potassium in normal subjects and patients
Potassium
Family of flowering plants
moth larvae,Phthorimaea operculella Zell. (Lepidoptera: Gelechiidae), in relation to their host plants". Journal of Insect Behavior. 1 (3): 261–275. Bibcode:1988JIBeh
Solanaceae
1994 film directed by Paul Flaherty
Charles Grodin were cast because they were above average in height in relation short. For shots of Clifford from the back, a five-foot-even body double
Clifford_(film)
individual pieces of data. SQL databases based on this design would create joins that would reconnect the entire relation back together, suffering performance
ObjectDatabase++
1982 novel by Lin Carter
Lugosi). The Earth-Shaker title listing at the Internet Speculative Fiction Database Price, Robert M. Lin Carter: A Look Behind His Imaginary Worlds. Mercer
The_Earth-Shaker
Genus of coniferous trees
"Latitudinal variation in morphological traits of the genus Pinus and its relation to environmental and phylogenetic signals". Plant Ecology & Diversity.
Pine
Slavic mythological creature
include depictions of kikimory, which are spider-like monsters that have no relation to folkloric kikimoras. A unrelated character named Kikimora in Disney's
Kikimora
2018 American comedy-drama film by Jim Cummings
perilously close to embracing [the lead's] aggrieved worldview, particularly in relation to his marriage, which forms the narrative’s most dubious (and clumsily
Thunder_Road_(2018_film)
1971 studio album by Eloy
leader Frank Bornemann, members of Eloy had "polarizing positions taken in relation to their artistic direction" at the time, but they "did manage to put an
Eloy_(album)
travel, tourism, insurance
RELATION DATABASE
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travel, tourism, insurance