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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
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
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
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
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
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
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
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)
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
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)
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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)
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
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
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
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
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
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
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
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
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
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
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
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
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
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
indicates how many parts where shipped. Referential constraints known as Foreign keys ensure that these attributes can only hold values that are also found
Suppliers_and_Parts_database
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
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
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
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
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
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
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
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
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)
Independent school
National Curriculum - Key Stages 1–3. Seoul Foreign School has been located in Yeonhui-dong, Seodaemun-gu, since 2026. Seoul Foreign School is accredited
Seoul_Foreign_School
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
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
Data analysis technique
source database, including value patterns and distributions, key candidates, foreign-key candidates, and functional dependencies Assess whether known
Data_profiling
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)
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
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
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
Integrity Refactoring category: Add Foreign Key Constraint; Add Trigger for Calculated Column; Drop Foreign Key Constraint; Introduce Cascading Delete;
Database_refactoring
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
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
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
1948 film noir crime drama
Key Largo is a 1948 American film noir crime drama directed by John Huston and starring Humphrey Bogart, Edward G. Robinson and Lauren Bacall. The supporting
Key_Largo_(film)
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
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
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
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
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
Unique identifier given to DNA or a protein sequence
Because of its relative stability, accession numbers can be utilized as foreign keys for referring to a sequence object, but not necessarily to a unique sequence
Accession number (bioinformatics)
Accession_number_(bioinformatics)
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)
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)
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)
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
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)
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
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
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)
U.S. federal executive national security and intelligence forum
government agencies. The council has subsequently played a key role in most major events in U.S. foreign policy, from the Korean War to the war on terror. The
United States National Security Council
United_States_National_Security_Council
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
Arrangement of keys on a typographic keyboard
any specific physical, visual, or functional arrangement of key switches, legends, or key mapping (respectively) of a keyboard. Layouts are used on computer
Keyboard_layout
Prime Minister of the United Kingdom in 2022
prime ministers – David Cameron, Theresa May and Boris Johnson – lastly as foreign secretary from 2021 to 2022. Truss studied philosophy, politics and economics
Liz_Truss
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
(Paul Beynon-Davies, 2004, p.108). Tables are linked using primary key to foreign key relationships. It is possible for users to update one table in a relationship
Propagation_constraint
Israeli spokesman
human rights. The New York Times called Keyes "a pioneer in online activism." From 2016 to 2018, Keyes was the foreign media advisor to Israeli Prime Minister
David_Keyes
Iranian diplomat and writer
Iranian diplomat and legal expert, who has served as his country's Deputy Foreign Minister for Legal and International Affairs since September 2024. He has
Kazem_Gharibabadi
Creation of knowledge from structured and unstructured sources
each column that is neither part of a primary or foreign key, construct a triple containing the primary key IRI as the subject, the column IRI as the predicate
Knowledge_extraction
Below is a list of foreign electoral interventions by country. During the 1991 election campaign, politicians of the center-right Democratic Party of
List of foreign electoral interventions
List_of_foreign_electoral_interventions
U.S. government agency
security implications of foreign investments in the U.S. economy. CFIUS, led by the U.S. Treasury Secretary, includes members from key government departments
Committee on Foreign Investment in the United States
Committee_on_Foreign_Investment_in_the_United_States
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
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
Government ministry of the Netherlands
Ministry of Foreign Affairs (Dutch: Ministerie van Buitenlandse Zaken; BZ) is the Netherlands' ministry responsible for foreign relations, foreign policy,
Ministry of Foreign Affairs (Netherlands)
Ministry_of_Foreign_Affairs_(Netherlands)
FOREIGN KEY
FOREIGN KEY
Girl/Female
Muslim
Strange, Foreign
Boy/Male
Anglo, British, English
Foreign
Girl/Female
Arabic, British, English, French, German, Greek
Foreign
Girl/Female
British, English, Greek
Bright Fame; Strange; Foreign
Girl/Female
Finnish, German, Greek, Swedish
Foreign; Strange
Girl/Female
Indian
Strange, Foreign
Girl/Female
American, Australian, British, Christian, English, Greek, Irish
Light; Foreign
Girl/Female
American, Christian, Danish, English, Finnish, Greek, Indian, Swedish, Tamil
Strange; Foreign
Girl/Female
Muslim/Islamic
Strange foreign
Boy/Male
Anglo, Australian, British, English
Foreign
Girl/Female
German, Greek, Russian
Stranger; Foreign; Strange
Boy/Male
Indian
Foreign
Boy/Male
Hindu, Indian, Marathi, Tamil
Foreign
Girl/Female
German, Italian, Swedish, Swiss
Foreign Woman
Surname or Lastname
English
English : variant spelling of Forman 1 and 2.Respelling of North German Formann, a variant of Fuhrmann.
Boy/Male
Muslim
Foreign
Boy/Male
Bengali, Indian
Foreign Land
Girl/Female
Australian, Christian, French, Greek
Foreign
Girl/Female
American, Australian, British, Christian, Danish, Dutch, English, French, German, Greek, Latin
Light; Pity; Foreign
Boy/Male
British, English
Foreign
FOREIGN KEY
FOREIGN KEY
Girl/Female
Arthurian Legend
The Lady of the Lake.
Girl/Female
Greek
Honest image.
Girl/Female
Assamese, Celebrity, Gujarati, Hindu, Indian, Jain, Kannada, Malayalam, Marathi, Sanskrit, Sindhi, Tamil, Traditional
Brightness; Light; Ray of Light
Girl/Female
Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Praised
Surname or Lastname
English
English : topographic name for someone living on the north side of a road, from Middle English north ‘north’ + weye ‘way’, ‘path’, ‘road’, or a habitational name from a minor place name of the same origin.
Female
Finnish
Pet form of Finnish Hanne, HANNELE means "favor; grace."
Boy/Male
Arabic, Muslim
Honour; Esteem; Regard; Affection; To Respect an Honour; Raise to an Exalted Position
Girl/Female
Latin
Goddess of marriage.
Girl/Female
Arabic, Finnish, Indian, Swedish
Shining Light; Lights
Girl/Female
Hebrew Latin
White.
FOREIGN KEY
FOREIGN KEY
FOREIGN KEY
FOREIGN KEY
FOREIGN KEY
v. t.
To represent by a false appearance of; to pretend; to counterfeit; as, to feign a sickness.
n.
The time during which a king, queen, or emperor possesses the supreme authority; as, it happened in the reign of Elizabeth.
a.
Foreign.
v. i.
To reign again.
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.
pl.
of Foreman
n.
A foreign trader.
a.
Foreign; outlandish.
a.
Having traveled; foreign.
a.
Strange; foreign.
a.
Foreign; not native.
a.
Foreign; not native.
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.
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.
Outside; extraneous; separated; alien; as, a foreign country; a foreign government.
a.
Foreign.
a.
Held at a distance; excluded; exiled.
a.
Foreign; alien.
n.
One who comes from a foreign land; a foreigner.