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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
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
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
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)
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
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
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
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
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
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
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
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
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
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
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
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
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)
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
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
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
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
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
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
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)
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
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
Philosophical conception of meaning
of semantics and philosophy of language. Meanings can be categorised in relation to the types of things being represented. Some examples include: things
Meaning_(philosophy)
Science of classifying organisms
In 1970, Michener et al. defined "systematic biology" and "taxonomy" in relation to one another as follows: Systematic biology (hereafter called simply
Taxonomy_(biology)
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)
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)
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
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
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
Philosophical study of being
inventory of reality by employing categories such as substance, property, relation, state of affairs, and event. Ontologists disagree regarding which entities
Ontology
1932 Japanese film
"Retrospektive" program. "No Blood Relation". Japanese Movie Database (in Japanese). Retrieved 19 February 2021. "生さぬ仲 (No Blood Relation)". Kinenote (in Japanese)
No_Blood_Relation
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
Pseudonym of the creator of Bitcoin
part of the implementation, Nakamoto also devised the first blockchain database. Nakamoto was active in the development of bitcoin until December 2010
Satoshi_Nakamoto
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
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
Country in Eastern Europe and West Asia
nations and primarily speak Georgian, a Kartvelian language that has no relation to any other language family in the world. Georgia has been inhabited since
Georgia_(country)
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
Structured system of communication
ancient world. Greek philosophers such as Gorgias and Plato debated the relation between words, concepts and reality. Gorgias argued that language could
Language
Human male external reproductive organ
sexual prowess and penis size and the social judgement of penis size in relation to 'manhood'.[unreliable medical source?] The shape of the human penis
Human_penis
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
Use of AI by the Israel Defense Forces in the Gaza war
strike is excessive in relation to the military advantage. "Israel Defence Forces' response to claims about use of 'Lavender' AI database in Gaza". The Guardian
AI-assisted targeting in the Gaza Strip
AI-assisted_targeting_in_the_Gaza_Strip
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
considered one of the indicators of a country's standard of living, The relation between GDP per capita and standard of living has been criticized. Alternative
List of countries by GDP (PPP) per capita
List_of_countries_by_GDP_(PPP)_per_capita
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
External genitalia of the female mammal
great deal of variation in the appearance of the vulva, particularly in relation to the labia minora. The vulva can be affected by many disorders, which
Vulva
Country in West Asia
government have been characterized as "demographic engineering", especially in relation to Kuwait's stateless Bedoon crisis and the history of naturalization in
Kuwait
In linguistics, troponymy is the presence of a 'manner' relation between two lexemes. The concept was originally proposed by Christiane Fellbaum and George
Troponymy
Condition involving social and behavioral differences
adults' experiences of interacting with other autistic people and its relation to Quality of Life: A systematic review and thematic meta-synthesis". Autism
Autism
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
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
American actor (1927–2011)
pipe, Columbo chews up six cigars a day. Television critic Ben Falk (no relation) added that Falk "created an iconic cop ... who always got his man (or
Peter_Falk
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
General dislike of humanity
all of humanity. A further way to categorize forms of misanthropy is in relation to the type of attitude involved toward humanity. In this regard, philosopher
Misanthropy
Medication for pain and fever
2013). "Metabolism and disposition of acetaminophen: recent advances in relation to hepatotoxicity and diagnosis". Pharm Res. 30 (9): 2174–2187. doi:10
Paracetamol
Puerto Rican actor and director (1912–1992)
but did not appear in, Strange Fruit (1945–46), starring Mel Ferrer (no relation). Among other radio roles, Ferrer starred as detective Philo Vance in a
José_Ferrer
Topics referred to by the same term
optimization problem that the solution must satisfy Constraint (mechanics), a relation between coordinates and momenta Constraint (computational chemistry) Constraint
Constraint
American actress, model, and singer (1921–2011)
singles chart in May 1954, selling two million copies. Della Russell, no relation to Jane, soon left the group, but Jane, Haines and Davis followed up with
Jane_Russell
Theorem of expressive equivalence between relational languages
"select all tuples other than those occurring in relation R", where R is a relation in the database. Assuming different domains, i.e., sets of atomic
Codd's_theorem
American bounty hunter and TV personality
which consisted of his son, Leland, and an associate, Tim Chapman (no relation). The three bounty hunters captured Luster in Puerto Vallarta, Mexico,
Duane_Chapman
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
Inference rules in database theory
set of functional dependencies F {\displaystyle F} , an Armstrong relation is a relation which satisfies all the functional dependencies in the closure F
Armstrong's_axioms
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
Awareness of facts
good reasons for believing it. This implies some form of appraisal in relation to an evaluative standard of rationality. For example, a person who just
Declarative_knowledge
transmission the grouping of bits may be completely arbitrary and have no relation to actual characters. (The term is coined from bite, but respelled to avoid
Glossary_of_computer_science
Tropical, edible, staple fruit
Compositional Characterization of Cultivated Colombian Musaceae (Musa sp.) in Relation to Consumer Preferences". Journal of Agricultural and Food Chemistry. 57
Banana
2004 film by Garry Marshall
Unlike the first film, it is not based on any existing book, and has no relation to the second installment in the book series, The Princess Diaries, Volume
The Princess Diaries 2: Royal Engagement
The_Princess_Diaries_2:_Royal_Engagement
American 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
Disease that damages the myelin sheaths around nerves
as diet and hormone intake, have been evaluated, but evidence on their relation with the disease is "sparse and unpersuasive". Gout occurs less than would
Multiple_sclerosis
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
Triple star system in the constellation Eridanus
the planet Vulcan orbits 40 Eridani A. Vulcan has been referenced in relation to the real-life search for exoplanets in this system. The hypothetical
40_Eridani
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
Art and technique of designing buildings
art, dealing with aesthetic value of architecture, its semantics and its relation to the development of culture. Many philosophers and theoreticians from
Architecture
British politician (born 1976)
attacks", and invited Lowe to defect to the Conservatives. In August 2025, in relation to the acquittal of Labour Councillor Ricky Jones on a charge of inciting
Chris_Philp
German philosopher (1844–1900)
Mahayana tradition. Occasionally, Nietzsche has also been considered in relation to Catholic mystics such as Meister Eckhart. Milne has argued against such
Friedrich_Nietzsche
Extinct species of bird
eyes, almost reaching their beak, as in dodos. The forehead was high in relation to the beak, and the nostril was located low on the middle of the beak
Dodo
Open source dictionary and controlled language subset
Because these relation types are standardized and unambiguously defined, Gellish English becomes computer interpretable. The relation types in the dictionary-taxonomy
Gellish_English
1968 American new religious movement
messages claimed to be from Jesus himself, elaborate this intimate, sexual relation they believe Jesus desires and needs. TFI imagines itself as his special
The_Family_International
Perennial woody plant with elongated trunk
(2015). "Formation of amphivasal vascular bundles in Dracaena draco stem in relation to rate of cambial activity". Trees. 29 (5): 1493–1499. Bibcode:2015Trees
Tree
Disclosures of NSA and related global espionage
2024. This document, dated 18 April of this year, clearly shows that the relation is very close indeed, seemingly growing even closer. 'NSA's relationship
Snowden_disclosures
2017 film by Guy Ritchie
writes that the film is "surprisingly good, and surprisingly political" in relation to the British withdrawal from the European Union, and "occasionally, it's
King Arthur: Legend of the Sword
King_Arthur:_Legend_of_the_Sword
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
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
List of tornadoes in the highest tornado intensity scales
doi:10.3390/atmos11111146. Cook, A. R.; Schaefer, J. T. (August 2008). "The Relation of El Niño–Southern Oscillation (ENSO) to Winter Tornado Outbreaks". Monthly
List of F5, EF5, and IF5 tornadoes
List_of_F5,_EF5,_and_IF5_tornadoes
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
Atypical antipsychotic medication
about unapproved uses of Seroquel." Multiple lawsuits have been filed in relation to quetiapine's side-effects, in particular, diabetes. Approximately 10
Quetiapine
American aerospace and defense corporation
settle 84 instances of misconduct, including US$615 million in 2006 in relation to illegal hiring of government officials and improper use of proprietary
Boeing
Mental disorder associated with trauma
N, Lind MJ, Kurtz ED, Rappaport LM, Berenz EC, et al. (4 April 2019). "Relation between coping and posttrauma cognitions on PTSD in a combat-trauma population"
Post-traumatic stress disorder
Post-traumatic_stress_disorder
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
Mexican professional wrestler (born 1989)
however, they did not promote the most recent La Sombra as having any relation to the previous incarnations at all, although the relationship was later
Andrade_El_Idolo
1993 film by Jane Campion
on VHS on May 25, 1994. Initial fears in leadup to its release were in relation to the films status as "arty" and "non-mainstream"; however, its nominations
The_Piano
Cancer of the colon or rectum
colon cancer risk have not supported an association, although an inverse relation was seen in the large European Prospective Investigation into Cancer and
Colorectal_cancer
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
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