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Concept in database systems
A foreign key is a set of attributes in a table that refers to the primary key of another table, linking these two tables. In the context of relational
Foreign_key
Candidate key with two or more attributes in a database
row). A compound key is a composite key for which each attribute that makes up the key is a foreign key in its own right. Composite keys have advantages
Composite_key
Digital database whose organization is based on the relational model of data
key. Rows in a table can be linked to rows in other tables by adding a column for the unique key of the linked row (such columns are known as foreign
Relational_database
Where all data references are valid
a foreign key can only contain either null values or values from a parent table's primary key or a candidate key. In other words, when a foreign key value
Referential_integrity
Unique identifier for either an entity in the modeled world or an object in the database
A surrogate key (or synthetic key, pseudokey, entity identifier, factless key, or technical key[citation needed]) in a database is a unique identifier
Surrogate_key
1985 studio album by Jandek
Foreign Keys is the second album released in 1985 by musician Jandek, and his eleventh overall. This is the first Jandek album featuring a full band, and
Foreign_Keys
Relationship between entities
key to foreign key relationship between two tables, where the record in the first table can relate to multiple records in the second table. A foreign
One-to-many_(data_model)
Topics referred to by the same term
another state Foreign accent syndrome, a side effect of severe brain injury Foreign key, a constraint in a relational database Foreign film or world cinema
Foreign
Concept in relational database design
DBMSs only allow a foreign key constraint against a primary key but most systems will allow a foreign key constraint to reference any key of a table. The
Unique_key
SQL clause
Department.DepartmentID is the primary key of the Department table, whereas Employee.DepartmentID is a foreign key. Note that in Employee, "Williams" has
Join_(SQL)
Maintenance of data over its entire life-cycle
columns chosen to be the primary key should be unique and not null. Referential integrity concerns the concept of a foreign key. The referential integrity rule
Data_integrity
Type of data model
being described. The attribute or parameter: typically implemented as a foreign key into a table of attribute definitions. The attribute definitions table
Entity–attribute–value_model
Level of database normalization
could reference via a foreign key. 3NF was defined, along with 2NF (which forbids dependencies on proper subsets of composite keys), in Codd's paper "Further
Third_normal_form
Correcting inaccurate computer records
codes. For example, a person's sex may be Female, Male, or Non-Binary. Foreign-key constraints: This is the more general case of set membership. The set
Data_cleansing
Database model
special cases of constraints are expressed as keys and foreign keys: A candidate key, or simply a key, is the smallest subset of attributes guaranteed
Relational_model
Free and open-source object relational database management system
properties, automatically updatable views, materialized views, triggers, foreign keys, and stored procedures. It is supported on all major operating systems
PostgreSQL
Serverless relational database management system
speed. WITHOUT ROWID tables are required to have a primary key. SQLite supports foreign key constraints, although they are disabled by default and must
SQLite
Technique used in relational databases
category of 'Vehicles' and a child of 'Cars' with a child of 'Mercedes', a foreign key table relationship must be established unless the tree table is natively
Nested_set_model
Robustness properties for database transactions
database invariant is referential integrity, which guarantees the primary key–foreign key relationship. Transactions are often executed concurrently (e.g., multiple
ACID
Relational databases concept
designation of a primary key may indicate the "preferred" identifier for data in the table, or that the primary key is to be used for foreign key references from
Primary_key
Structure in data warehousing
possible, but one cannot use Supplier_Code as foreign key on Product table and using Supplier_Key as foreign key each product is tied on specific time slice
Slowly_changing_dimension
Business data structure
that are a foreign key to dimension tables. The primary key of a fact table is usually a composite key that is made up of all of its foreign keys. Fact tables
Fact_table
Modifier key on some computer keyboards
as foreign currency symbols, typographic marks and accented letters. The AltGr key is used to access a third and a fourth grapheme for most keys. Most
AltGr_key
Mechanical or electronic fastening device
or set of locks that are keyed alike, a lock/key system where each similarly keyed lock requires the same, unique key. The key serves as a security token
Lock_and_key
Level of database normalization
breaking them up into separate relations associated with each other using foreign keys. This process is a necessary step when moving data from a non-relational
First_normal_form
2026 studio album by the Rolling Stones
Foreign Tongues is the twenty-fifth British and the twenty-seventh American studio album by the English rock band the Rolling Stones, released on 10 July
Foreign_Tongues
Database form
information is lost. Relationships that are impossible to express as foreign keys are obvious violations of DKNF. For example, a "Parent ID" attribute
Domain-key_normal_form
A type of item in a relational database, in computing
therefore, it must use a foreign key in conjunction with its attributes to create a primary key. The foreign key is typically a primary key of an entity it is
Weak_entity
Model or diagram describing interrelated things
between entities is implemented by storing the primary key of one entity as a pointer or "foreign key" in the table of another entity. There is a tradition
Entity–relationship_model
Storage engine for the MySQL database management system
provides the standard ACID-compliant transaction features, along with foreign key support (declarative referential integrity). It is included as standard
InnoDB
Prime Minister of New Zealand from 2008 to 2016
was appointed a member of the Foreign Exchange Committee of the Federal Reserve Bank of New York until leaving in 2001. Key entered the New Zealand Parliament
John_Key
Data structure for query optimization in databases
police database constraints, such as UNIQUE, EXCLUSION, PRIMARY KEY and FOREIGN KEY. An index may be declared as UNIQUE, which creates an implicit constraint
Database_index
technology and U.S. standard" are preeminent. Liberalism has been a key component of US foreign policy since its independence from Britain. Since the end of
Foreign policy of the United States
Foreign_policy_of_the_United_States
Concept in software engineering
persistence tools and in object–relational mapping (ORM). Typically, foreign key relationships will be exposed as an object instance of the appropriate
Active_record_pattern
Procedure in computing
a foreign key is a column in another table that refers to a primary key. Keys can comprise several columns, in which case they are composite keys. In
Extract,_transform,_load
Converting data between different formats
limited set of master database tables by a network of foreign key constraints. Each foreign key constraint is dependent upon a unique database index from
Data transformation (computing)
Data_transformation_(computing)
Topics referred to by the same term
PUB 10-4 :FK) .fk, top-level Internet domain for the Falkland Islands Foreign key, in database design Forward kinematics, in robotics and animation Kinetic
FK
Data analysis technique
source database, including value patterns and distributions, key candidates, foreign-key candidates, and functional dependencies Assess whether known
Data_profiling
Data standard for public transport information
(primary key) route_short_name route_long_name route_type background_color foreground_color Required fields: trip_id (primary key) route_id (foreign key) service_id
GTFS
American singer and songwriter (born 1981)
is a sequel to the single "City of Gods" by Fivio Foreign, Kanye West and Keys. On July 14, 2022, Keys unveiled that "Come for Me" featuring Khalid and
Alicia_Keys
Type of data modeling language
set constitutes a candidate key. Primary keys The candidate key selected as the unique identifier of an entity. Foreign keys An attribute, or combination
IDEF1X
Term in relational and entity–relationship theory
together by referencing the primary keys (PK) of each data table. In effect, it contains a number of foreign keys (FK), each in a many-to-one relationship
Associative_entity
Type of computer program
stored in separate tables and linked using keys. When records in different tables are related, a foreign key is used to associate them. For example, an
Document-oriented_database
Coral cay archipelago in Florida, United States
officer and requested US$1,000,000,000 in "foreign aid". The stunt succeeded in generating great publicity for the Keys' plight, and the inspection station roadblock
Florida_Keys
expanding circle of nations. The foreign relations of Ukraine are guided by a number of key priorities outlined in the foreign policy of Ukraine. Ukraine considers
Foreign_relations_of_Ukraine
Syntax for defining data structures
referential integrity relationships, usually implemented as primary key and foreign key tags in some columns of the tables. These two statements can be included
Data_definition_language
side, or vehicles that use key technologies developed by Chinese manufacturers, even if they are marketed under a foreign badge. Mini Cooper E/SE (J01)
List of foreign brand vehicles made by automobile manufacturers of China
List_of_foreign_brand_vehicles_made_by_automobile_manufacturers_of_China
Topics referred to by the same term
solution-finding Integrity constraints in databases Check constraint Foreign key constraint Specific types of mechanical constraints: First-class constraint
Constraint
American politician (1872–1940)
the Foreign Relations Committee. Pittman was born in Vicksburg, Mississippi on September 12, 1872, a son of William Buckner Pittman and Katherine Key Pittman
Key_Pittman
Tree-like structure for data
"ReportsTo" column. In Relational database terms, the ReportsTo column is a foreign key referencing the EmpNo column. If the "child" data type were different
Hierarchical_database_model
Computer key
for persons using foreign languages, mathematics, currency symbols, business use, etc. Some computers work the same if the Num Lock key is on. On a Macintosh
Alt_key
surrogate key. The only purpose of the POID is to act as the primary key on the table where it is defined and to be referenced as the foreign key by other
Persistent_object_identifier
French Army corps of foreign nationals
French Foreign Legion (French: Légion étrangère, also known simply as la Légion, 'the Legion') is a corps of the French Army created to allow foreign nationals
French_Foreign_Legion
Set of attributes that uniquely identifies each tuple of a relation
instance relations of that relation schema. Alternate key Candidate key Compound key Foreign key Primary key Date, Christopher (2015). "Codd's First Relational
Superkey
Level of database normalisation
and LensId, LensProductType respectively. For this foreign key relationship to work, an "elementary key" must be made on the Product table on Id and Type
Elementary_key_normal_form
American politician (born 1950)
in the U.S. Foreign Service in 1979 at the United States consulate in Mumbai, India, and later in the American embassy in Zimbabwe. Keyes was appointed
Alan_Keyes
Number of bits in a key used by a cryptographic algorithm
In cryptography, key size or key length refers to the number of bits in a key used by a cryptographic algorithm (such as a cipher). Key length defines the
Key_size
2024 bridge collapse near Baltimore, Maryland, US
spans and the three nearest northeast approach spans of the Francis Scott Key Bridge across the Patapsco River in the Baltimore metropolitan area of Maryland
Francis Scott Key Bridge collapse
Francis_Scott_Key_Bridge_collapse
Computer key
The Command key (sometimes abbreviated as Cmd key), ⌘, formerly also known as the Apple key or open Apple key, is a modifier key present on Apple keyboards
Command_key
Process of ensuring computer data is both correct and useful
relational database tables can be linked through foreign key and primary key. If values in the foreign key field are not constrained by internal mechanisms
Data_validation
Set of conceptual and technical difficulties
typed fields. Links are reversible (INNER JOIN is symmetric to follow foreign keys backward), forming undirected graphs. Object encapsulation hides internals
Object–relational impedance mismatch
Object–relational_impedance_mismatch
Database using graph structures for queries
over several tables are required. In working with relational models, foreign key constraints should also be considered when retrieving relationships,
Graph_database
Structure that categorizes facts and measures in a data warehouse
new dimensions resulting in a fact table with a very large number of foreign keys. The designer could also decide to leave the remaining attributes in
Dimension_(data_warehouse)
American academic journal
Condor. Maxwell claims that key Council on Foreign Relations members, acting at Kissinger's behest, put pressure on Foreign Affairs editor James Hoge to
Foreign_Affairs
Numerical relationship among rows in different tables
their first name. A table can also have a foreign key which indicates that field is linked to the primary key of another table. A complex data model can
Cardinality_(data_modeling)
International airport in Key West, Florida
Key West International Airport (IATA: EYW, ICAO: KEYW, FAA LID: EYW) is an airport located in the City of Key West in Monroe County, Florida, United States
Key West International Airport
Key_West_International_Airport
Israeli Knesset committee
The Foreign Affairs and Defense Committee (Hebrew: ועדת חוץ וביטחון) is a permanent Knesset committee which oversees key foreign and defense issues of
Foreign Affairs and Defense Committee
Foreign_Affairs_and_Defense_Committee
Database class for storage and retrieval of modeled data
approaches is more appropriate. Instead of only storing foreign keys, it is common to store actual foreign values along with the model's data. For example, each
NoSQL
President of Kazakhstan since 2019
as well as state secretary from 2002 to 2003, playing a key role in shaping Kazakhstan's foreign policy and its nuclear disarmament policies. In March 2019
Kassym-Jomart_Tokayev
Government ministry of Cuba
of Foreign Affairs (Spanish: Ministerio de Relaciones Exteriores), also known as MINREX, is the Cuban government ministry which oversees the foreign relations
Ministry of Foreign Affairs (Cuba)
Ministry_of_Foreign_Affairs_(Cuba)
Student service-leadership organization
Key Club International, also called Key Club, is an international service organization for high school students. Key Club International is the high school
Key_Club
Neighborhood of Miami in Miami-Dade County, Florida, United States
4.7%, while the percentage of foreign born residents was 51.3%. Brickell Key from the south, February 2010 Brickell Key and Brickell "Henry Flagler Biography"
Brickell_Key
Law of the People's Republic of China
effect on January 1, 2020. The Foreign Investment Law calls for the gradual elimination of caps on foreign ownership in key Chinese industries, including
Foreign Investment Law of the People's Republic of China
Foreign_Investment_Law_of_the_People's_Republic_of_China
Systems analysis concept
In this case the logical primary key for AB is formed from the two foreign keys (i.e. copies of the primary keys of A and B). In web application frameworks
Many-to-many_(data_model)
Data analysis tool for Microsoft Excel
relationships can be established between multiple tables to effectively create foreign key joins. Power Pivot can scale to process very large datasets in memory
Power_Pivot
government agency responsible for overseeing the foreign policy of the Republic of Guinea-Bissau. It is one of the key ministries in the Guinea-Bissau Government
Ministry of Foreign Affairs (Guinea-Bissau)
Ministry_of_Foreign_Affairs_(Guinea-Bissau)
Data warehousing schema
specific event. Fact tables generally consist of numeric values, and foreign keys to dimensional data where descriptive information is kept. Fact tables
Star_schema
Set of metadata that contains definitions and representations of data elements
a PHP class library to automate the creation of tables, indexes, and foreign key constraints portably for multiple databases. Another PHP-based data dictionary
Data_dictionary
UK ministry of foreign affairs
The Foreign, Commonwealth and Development Office (FCDO), or Foreign Office is the ministry of foreign affairs and a ministerial department of the government
Foreign, Commonwealth and Development Office
Foreign,_Commonwealth_and_Development_Office
Database command for removing data
in a TRUNCATE TABLE statement. TRUNCATE TABLE cannot be used when a foreign key references the table to be truncated, since TRUNCATE TABLE statements
Truncate_(SQL)
Swedish writer (1849–1926)
reasons. Key was mostly educated at home, where her mother taught her grammar and arithmetic and her foreign-born governess taught her foreign languages
Ellen_Key
1948 film noir crime drama
Key Largo is a 1948 American film noir crime drama by director John Huston and starring Humphrey Bogart, Edward G. Robinson and Lauren Bacall. The supporting
Key_Largo_(film)
Key & Peele is an American sketch comedy television series starring Keegan-Michael Key and Jordan Peele, both former cast members of MADtv. Each episode
List_of_Key_&_Peele_episodes
List of research institution laboratories in China
State Key Laboratory (SKL; 国家重点实验室) is a national designation awarded to university- and enterprise-owned research institutions and laboratories that
State_Key_Laboratory
Government ministry of Iceland
Ministers of Foreign Affairs, their party, date of assuming and leaving office, their tenure in years and days, and the cabinet they served in. Key Independence
Ministry for Foreign Affairs (Iceland)
Ministry_for_Foreign_Affairs_(Iceland)
Values that a data element may contain
tables are formally related to other tables in a database by the use of foreign keys. Simple domain boundary rules, if database-enforced, may be implemented
Data_domain
Relational database theory concept
involve mostly queries.) Heath's decomposition leaves only X to act as a foreign key in the remainder of the big table Π X Z ( R ) {\displaystyle \Pi _{XZ}(R)}
Functional_dependency
Normal form used in database normalization
CA: O'Reilly Media. ISBN 978-1-4493-1644-0. Date, C. J. (2011). Keys, Foreign Keys, and Relational Theory. Sebastopol, CA: O'Reilly Media. ISBN 978-1-4493-0702-8
Boyce–Codd_normal_form
Cemetery in Key West, Florida
The Key West Cemetery (officially, Historic Key West City Cemetery) is a 19-acre (77,000 m2) cemetery at the foot of Solares Hill on the island of Key West
Key_West_Cemetery
workforce. In most places they staffed key technical positions. The 1930s were marked by a series of foreign workers’ strikes in the Soviet Union. Workers
Foreign workers in the Soviet Union
Foreign_workers_in_the_Soviet_Union
Government ministry of Barbados
The Ministry of Foreign Affairs and Foreign Trade of Barbados is a key Barbadian government agency responsible for regulating, maintaining, and developing
Ministry of Foreign Affairs, Foreign Trade and International Business (Barbados)
Ministry_of_Foreign_Affairs,_Foreign_Trade_and_International_Business_(Barbados)
Concept in relational databases
empty set of attributes (or columns). The same format applies to the foreign key (abbreviated FK) because each FK matches a preexistent PK. Each of attributes
Entity_integrity
Supranational central bank in Europe
the foreign exchange reserves of EU member states, engages in foreign exchange operations, and defines the intermediate monetary objectives and key interest
European_Central_Bank
United States Navy serves as a key element of United States global power projection and its ability to conduct foreign interventions. As a blue-water
Foreign interventions by the United States
Foreign_interventions_by_the_United_States
Identifier issued by the US SEC
A Central Index Key or CIK number is a unique number assigned to an individual, company, filing agent or foreign government by the United States Securities
Central_Index_Key
Composite data type
then be retrieved using a primary key. The tables themselves are also records which may have a foreign key: a key that references data in another table
Record_(computer_science)
Unrecognised state in Southern Africa (1965–1979)
government retained a formal veto over measures affecting natives and dominated foreign policy. Over the course of the next three decades, Southern Rhodesia experienced
Rhodesia
Foreign exchange reserves of various countries
Foreign exchange reserves, also called Forex reserves, in a strict sense, are foreign-currency deposits held by nationals and monetary authorities. However
List of countries by foreign exchange reserves
List_of_countries_by_foreign_exchange_reserves
diplomatic foreign relations of the United Kingdom are conducted by the Foreign, Commonwealth and Development Office, headed by the foreign secretary.
Foreign relations of the United Kingdom
Foreign_relations_of_the_United_Kingdom
Interventions by foreign governments in elections
Foreign electoral interventions (FEI) are attempts by a government to influence the elections of another country. Common methods include backing a preferred
Foreign electoral intervention
Foreign_electoral_intervention
FOREIGN KEY
FOREIGN KEY
Girl/Female
Indian
Strange, Foreign
Girl/Female
Muslim/Islamic
Strange foreign
Boy/Male
Anglo, Australian, British, English
Foreign
Girl/Female
British, English, Greek
Bright Fame; Strange; Foreign
Girl/Female
American, Australian, British, Christian, English, Greek, Irish
Light; Foreign
Girl/Female
German, Greek, Russian
Stranger; Foreign; Strange
Girl/Female
American, Australian, British, Christian, Danish, Dutch, English, French, German, Greek, Latin
Light; Pity; Foreign
Surname or Lastname
English
English : variant spelling of Forman 1 and 2.Respelling of North German Formann, a variant of Fuhrmann.
Boy/Male
Anglo, British, English
Foreign
Boy/Male
British, English
Foreign
Girl/Female
American, Christian, Danish, English, Finnish, Greek, Indian, Swedish, Tamil
Strange; Foreign
Boy/Male
Muslim
Foreign
Girl/Female
Muslim
Strange, Foreign
Girl/Female
Australian, Christian, French, Greek
Foreign
Boy/Male
Bengali, Indian
Foreign Land
Girl/Female
German, Italian, Swedish, Swiss
Foreign Woman
Girl/Female
Finnish, German, Greek, Swedish
Foreign; Strange
Girl/Female
Arabic, British, English, French, German, Greek
Foreign
Boy/Male
Hindu, Indian, Marathi, Tamil
Foreign
Boy/Male
Indian
Foreign
FOREIGN KEY
FOREIGN KEY
Boy/Male
Arabic, Muslim
Medal; Prize; Honour
Boy/Male
Indian, Telugu
Permanent
Girl/Female
Tamil
Shivangi | ஷிவாஂகீ
Half part of Hindu Lord Shiva, Auspicious
Biblical
strong; a goat
Boy/Male
Native American
Blackbird.
Surname or Lastname
English
English : variant of Redman or Redmond.
Boy/Male
Arabic, Muslim, Pashtun
Man of Honour; Pat - Honour; Man - Self
Female
Polish
Feminine form of Polish SÅ‚awomir, SÅAWOMIRA means "glorious peace."
Boy/Male
Gujarati, Indian
World
Surname or Lastname
English
English : variant of Beaumont.Catalan : from the place name Bellmont, a variant of Bellmunt ‘beautiful mountain’. Compare Spanish Belmonte.
FOREIGN KEY
FOREIGN KEY
FOREIGN KEY
FOREIGN KEY
FOREIGN KEY
a.
Not native or belonging to a certain country; born in or belonging to another country, nation, sovereignty, or locality; as, a foreign language; foreign fruits.
a.
Foreign; not native.
a.
Remote; distant; strange; not belonging; not connected; not pertaining or pertient; not appropriate; not harmonious; not agreeable; not congenial; -- with to or from; as, foreign to the purpose; foreign to one's nature.
a.
Foreign; outlandish.
v. t.
To represent by a false appearance of; to pretend; to counterfeit; as, to feign a sickness.
v. i.
To reign again.
n.
One who comes from a foreign land; a foreigner.
a.
Foreign.
n.
A person belonging to or owning allegiance to a foreign country; one not native in the country or jurisdiction under consideration, or not naturalized there; an alien; a stranger.
a.
Held at a distance; excluded; exiled.
a.
Foreign; alien.
a.
Foreign; not native.
n.
The time during which a king, queen, or emperor possesses the supreme authority; as, it happened in the reign of Elizabeth.
n.
A foreign trader.
pl.
of Foreman
a.
Foreign.
a.
Strange; foreign.
a.
Having traveled; foreign.
a.
Outside; extraneous; separated; alien; as, a foreign country; a foreign government.