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Relational databases concept
In the relational model of databases, a primary key is a designated set of attributes (column(s)) that can reliably identify and distinguish between each
Primary_key
Concept in relational database design
but only one of them is used as the primary key of the relation. The remaining candidate keys are called unique keys because they can uniquely identify
Unique_key
Variable containing a public key in Windows NT 4.0
Industry and Security (BIS). It was already known that Microsoft used two keys, a primary and a spare, either of which can create valid signatures. Upon releasing
NSAKEY
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
Digital database whose organization is based on the relational model of data
have a unique primary key (PK) for each row in a table. When a new row is written to the table, a new unique value for the primary key is generated; this
Relational_database
Unique identifier for either an entity in the modeled world or an object in the database
world and the primary key of the database. In this case the surrogate may be used as a primary key, resulting in the term surrogate key. In a temporal
Surrogate_key
Keyboard key meant for Windows devices
The Windows key (also known as the win, start, logo, flag or super key) is a computer keyboard key originally introduced on Microsoft's Natural Keyboard
Windows_key
Reduction of data redundancy
the relational model has a primary key which uniquely identifies a row. In our example, the primary key is a composite key of {Title, Format}, indicated
Database_normalization
Candidate key with two or more attributes in a database
primary key firstName + lastName for students is a composite key. Relational database Alternate key Candidate key Foreign key Primary key Unique key Superkey
Composite_key
Topics referred to by the same term
Look up key or Keys in Wiktionary, the free dictionary. Key, Keys, The Key or The Keys may refer to: Key (cryptography), a piece of information needed
Key
A type of item in a relational database, in computing
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 related
Weak_entity
Relationship between entities
rather of the relationship itself. One-to-many often refer to a primary key to foreign key relationship between two tables, where the record in the first
One-to-many_(data_model)
Data warehousing schema
are generally assigned a surrogate key to ensure each row can be uniquely identified. This key is a simple primary key. Dimension tables usually have a
Star_schema
Where all data references are valid
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
Set of columns in a relational database
attributes. Specific candidate keys are sometimes called primary keys, secondary keys or alternate keys. The columns in a candidate key are called prime attributes
Candidate_key
Concept in relational databases
concerned with ensuring that each row of a table has a unique and non-null primary key value; this is the same as saying that each row in a table represents
Entity_integrity
Composite data type
can 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
Record_(computer_science)
Syntax for defining data structures
[column name] [data type] {NULL | NOT NULL} {column options} Primary key definition: PRIMARY KEY ( [comma separated column list] ) Constraints: {CONSTRAINT}
Data_definition_language
Numerical relationship among rows in different tables
"key fields". A "primary key" assigns a field to its "special order table". For example, the "Doctor Last Name" field might be assigned as a primary key
Cardinality_(data_modeling)
identifier (POID) is a unique identifier of a record on a table, used as the primary key. Important characteristics of a POID are that it does not carry business
Persistent_object_identifier
Serverless relational database management system
lookup speed. WITHOUT ROWID tables are required to have a primary key. SQLite supports foreign key constraints, although they are disabled by default and
SQLite
Systems analysis concept
→ AB. 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
Many-to-many_(data_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
immutable natural key as a primary key. In a good database design, a natural key which can change should not be considered as a "real" primary key. Use of a mutable
Log_trigger
Maintenance of data over its entire life-cycle
concerns the concept of a primary key. Entity integrity is an integrity rule which states that every table must have a primary key and that the column or
Data_integrity
NoSQL database service
searches can make queries slower. Many of Amazon's services demanded mostly primary-key reads on their data, and with speed a top priority, putting these pieces
Amazon_DynamoDB
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
Data structure for query optimization in databases
used to police database constraints, such as UNIQUE, EXCLUSION, PRIMARY KEY and FOREIGN KEY. An index may be declared as UNIQUE, which creates an implicit
Database_index
Procedure in computing
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 many
Extract,_transform,_load
Mathematical concept
databases as a surrogate key for registering and identifying unique entries in a table (in which case it is used as a primary key). Historically, the Norwegian
Sequence_number
Cybersecurity method in computer science
polyinstantiation, that two different instances have the same name (identifier, primary key). In Operating system security, polyinstantiation is the concept of creating
Polyinstantiation
Free and open-source database management system
Each row is identified by a primary key and contains columns. The first component of a table's primary key is the partition key; within a partition, rows
Apache_Cassandra
Set of data elements in databases
specific choice of columns which uniquely identify rows is called the primary key. "Table" is another term for "relation"; although there is the difference
Table_(database)
Searchable computer file
index, the primary index, contains the primary key. If other secondary indices are present, they contain alternate keys. The primary key must uniquely
Indexed_file
Type of unique key in a database
A natural key (also known as business key or domain key) is a type of unique key in a database formed of attributes that exist and are used in the external
Natural_key
Data standard for public transport information
route_id (primary key) route_short_name route_long_name route_type background_color foreground_color Required fields: trip_id (primary key) route_id (foreign
GTFS
Field in databases
a primary key in that its values are managed by the server and usually cannot be modified. In many cases an identity column is used as a primary key; however
Identity_column
Reference in a book to information at another place in the same work
is a cross-reference table that joins two or more tables together via primary key. "cross-reference". Oxford dictionary of English (3 ed.). Oxford: Oxford
Cross-reference
Term in relational and entity–relationship theory
tables 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
American sketch comedy series (2012–2015)
Key & Peele (abbreviated to K&P) is an American sketch comedy television series that ran from 2012 to 2015. It was created by Keegan-Michael Key and Jordan
Key_&_Peele
SQL statement
INSERT statement must satisfy all the applicable constraints (such as primary keys, CHECK constraints, and NOT NULL constraints). If a syntax error occurs
Insert_(SQL)
Dimensional Data modeling scenario
dimensional natural key during fact table source loading, prior to the assignment of a corresponding primary key or surrogate key in the dimension table
Early-arriving_fact
Database model
are candidate keys. The non-bold, underlined attributes are foreign keys. Usually one candidate key is chosen to be called the primary key and used in preference
Relational_model
Organized collection of data in computing
designated as a primary key by which the rows of the table could be uniquely identified; cross-references between tables always used these primary keys, rather
Database
Database algorithm
Hi/Lo is an algorithm and a key generation strategy used for generating unique keys for use in a database as a primary key. It uses a sequence-based hi-lo
Hi/Lo_algorithm
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
Database using graph structures for queries
unique key (or primary key) of the record. If the phone numbers are indexed, the same search would occur in the smaller index table, gathering the keys of
Graph_database
Button on Windows-oriented computer keyboards
In computing, the menu key (≣ Menu), or application key, is a key with the primary function to launch a context menu with the keyboard rather than with
Menu_key
SQL toolkit and object-relational mapper
Column(Integer, primary_key=True) title = Column(String(255), nullable=False) year = Column(Integer) directed_by = Column(Integer, ForeignKey("directors.id"))
SQLAlchemy
int NOT NULL FOREIGN KEY REFERENCES Supplier(SID), PID int NOT NULL FOREIGN KEY REFERENCES Part(PID), Qty int NOT NULL, PRIMARY KEY (SID, PID) ) Notes:
Suppliers_and_Parts_database
Island and city in Florida, United States
its outlying Florida Keys archipelago. Together with all or parts of the separate islands of Dredgers Key, Fleming Key, Sunset Key, and the northern part
Key_West
Custom SQL data type
Student_Table which will include all columns defined in Person_Type as well. Primary Key and Constraints should be defined during or after creation of table and
Structured_type
Business data structure
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
SQL clause
tables: Department.DepartmentID is the primary key of the Department table, whereas Employee.DepartmentID is a foreign key. Note that in Employee, "Williams"
Join_(SQL)
Topics referred to by the same term
(codebook), a codebook, a finite list of defined terms, used i.e. as a primary key in databases Hardware register, a group of memory cells, typically flip-flops
Register
1912 choral work by Pavel Chesnokov
to be the 1913 edition by J. Fischer & Bro. The keys of B minor and D major are the work's primary key centers, and it is cast in AA’ or two part strophic
Salvation_is_Created
bean is identified by a primary key. If the container in which an entity bean is hosted crashes, the entity bean, its primary key, and any remote references
Entity_Bean
state party only nominated Joe Biden as a candidate, cancelling the primary. Key: A – all adults RV – registered voters LV – likely voters V – unclear
2024 United States presidential election in Illinois
2024_United_States_presidential_election_in_Illinois
Sequence of steps used to access data in a SQL relational database management system
query engine will do a scan over the primary key index on the Employee table and a matching seek through the primary key index (the ContactID column) on the
Query_plan
Passage that brings a musical piece to an end
secondary key, but, in the recapitulation, in the primary key. The codetta ordinarily closes with a perfect cadence in the appropriate key, confirming
Coda_(music)
Musical exposition used in sonata form
first asserts the primary key of the piece, that is, the tonic. The second section moves to a different key, establishes that key firmly, arriving ultimately
Three-key_exposition
Level of database normalization
primary key of the containing relation and will therefore be appended as a foreign key to the new relation: In this modified design, the primary key is
First_normal_form
Educational level in the UK
5 and 7. This Key Stage normally covers pupils during infant school, although in some cases this might form part of a first or primary school. It is also
Key_Stage_1
Data input device
this posture, Klockenberg published a study in 1926 that suggested the primary key clusters for two-handed typists should be split into left and right halves
Computer_keyboard
Mechanical or electronic fastening device
a 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
Database that stores information relating to past, present and future time
columns to key fields, some issues arose. For example, if a table has a primary key and some attributes, adding a date to the primary key to track historical
Temporal_database
System to specify locations on Earth
authority, such as the EPSG Geodetic Parameter Dataset. SRIDs are the primary key for the Open Geospatial Consortium (OGC) spatial_ref_sys metadata table
Spatial_reference_system
Email authentication method designed to associate a domain with a message stream
DomainKeys Identified Mail (DKIM) is an email authentication method that permits a person, role, or organization that owns the signing domain to claim
DomainKeys_Identified_Mail
Identifier that is unique among all used identifiers
attributes of an entity that serve as unique identifiers are called primary keys. In mathematics, set theory uses the concept of element indices as unique
Unique_identifier
Structure that categorizes facts and measures in a data warehouse
referenced in a fact table as foreign keys to a date dimension. The date dimension primary key could be a surrogate key or a number using the format YYYYMMDD
Dimension_(data_warehouse)
Illinois 2024 United States elections 2024 Illinois Democratic presidential primary Key: A – all adults RV – registered voters LV – likely voters V – unclear
2024 Illinois Republican presidential primary
2024_Illinois_Republican_presidential_primary
the vote after no candidate received a majority in an August 11 special primary. Andrews won the Democratic nomination with 61.5% of the vote over former
2026 United States Senate election in South Carolina
2026_United_States_Senate_election_in_South_Carolina
Operating system
complement of the primary key, at which point reading forward on the alternate key was equivalent to reading previous on the primary key. In addition to
IBM_DPPX
Cluster of keys on a computer keyboard
modern games typically use the WASD keys for this purpose). The cursor keys predated the mouse pointer and were the primary means of cursor movement in the
Arrow_keys
IBM disk file programming interface
KSDS only has one key (the primary key), alternate indices may be defined to permit the use of additional fields as secondary keys. An alternate index
Virtual_Storage_Access_Method
Fundamental color in color mixing
subtractive primaries in that filters with those colors can be overlaid to yield a surprisingly large chromaticity gamut. A black (K) ink (from the older "key plate")
Primary_color
Single-use key in hybrid cryptosystems
There are two primary reasons to use session keys: Several cryptanalytic attacks become easier the more material encrypted with a specific key is available
Session_key
Computer software
unique key may contain NULL values since they are by definition a unique non-valued value. Primary key – Primary key are much like unique keys except
Virtuoso_Universal_Server
Research institute in Kyiv, Ukraine
support Lisp-13, language support Common-Lisp, language support CLIPS, primary key hierarchy database support BTIO, database support BerkeleyDB, connection
Kyiv Laboratory for Artificial Intelligence
Kyiv_Laboratory_for_Artificial_Intelligence
Ability to handle changing demands of resources
tables use a sequence number as their primary key that increases for each new inserted row. The index for that key can also experience contention (overheat)
Database_scalability
Kimball, in a data warehouse, a degenerate dimension is a dimension key (primary key for a dimension table) in the fact table that does not have its own
Degenerate_dimension
Database in which records or objects are found by following references from other objects
composite key can be considered as representing a navigational path to a record; but equally, it can be considered as a simple primary key allowing associative
Navigational_database
January 6. Presidential candidates are selected in a presidential primary, conducted through primary elections run by state governments or caucuses run by state
2028 United States presidential election
2028_United_States_presidential_election
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
persist.insert(customer); // Reads a customer by its primary key Customer c = persist.readByPrimaryKey(Customer.class, 42); // Retrieves customers using
Persist_(Java_tool)
Creation of knowledge from structured and unstructured sources
for 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
Knowledge_extraction
2024 United States elections 2024 Pennsylvania Democratic presidential primary Key: A – all adults RV – registered voters LV – likely voters V – unclear
2024 Pennsylvania Republican presidential primary
2024_Pennsylvania_Republican_presidential_primary
Relational database management system
defined primary key or a unique index declared across a set of non-nullable columns and must be related in a parent-child hierarchy via primary key-foreign
TimesTen
American politician (born 1950)
the Republican primary. Against Democrat Barbara Mikulski, he received 29 percent in the general election. During the 1992 election, Keyes attracted controversy
Alan_Keyes
Computer keyboard designed with ergonomic considerations
this posture, Klockenberg published a study in 1926 that suggested the primary key clusters for two-handed typists should be split into left and right halves
Ergonomic_keyboard
Topics referred to by the same term
determining the fate of substances administered to a living organism Primary key, a unique attribute within the relational model of databases PK, a magic
PK
supported the "don't ask, don't tell" policy. Keyes continued participating in the campaign for nearly all the primaries and continued to appear in the debates
2000 Republican Party presidential primaries
2000_Republican_Party_presidential_primaries
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
seek re-election to a third consecutive term. Primary elections were held on May 19, 2026, with a primary runoff held on June 16. Rick Jackson and Burt
2026 Georgia gubernatorial election
2026_Georgia_gubernatorial_election
Process of creating a new key based on an existing key
Key duplication refers to the process of creating a key based on an existing key. Key cutting is the primary method of key duplication: a flat key is fitted
Key_duplication
Level of database normalization
candidate key. William Kent summarised 3NF with the dictum that "a non-key field must provide a fact about the key, the whole key, and nothing but the key". An
Third_normal_form
Type of musical chord
triad found in a diatonic key corresponds to a particular diatonic function. Functional harmony tends to rely heavily on the primary triads: triads built on
Primary_triad
Database management system
statements such as these: CREATE TABLE Customers ( Id CHAR(12) NOT NULL PRIMARY KEY, Surname VARCHAR(32) NOT NULL, FirstName VARCHAR(32) NOT NULL, DOB DATE
Object–relational_database
International school in Thailand
1-2 Primary Key Stage 1: Year 1-2 Primary Key Stage 2: Year 3-6 Secondary Key Stage 3: Year 7-9 Secondary Key Stage 4: Year 10-11 Secondary Key Stage
Samui_Centre_of_Learning
Computer key to initiate glyph merger
A compose key (sometimes called multi key) is a key on a computer keyboard that indicates that the following (usually 2 or more) keystrokes trigger the
Compose_key
travel, tourism, insurance
PRIMARY KEY
PRIMARY KEY
PRIMARY KEY
PRIMARY KEY
PRIMARY KEY
PRIMARY KEY
PRIMARY KEY
PRIMARY KEY
PRIMARY KEY
travel, tourism, insurance