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Set of attributes that uniquely identifies each tuple of a relation
relational data model, a superkey is any set of attributes that uniquely identifies each tuple of a relation. Because superkey values are unique, tuples
Superkey
Reduction of data redundancy
ID, Supplier ID}}. No component of that join dependency is a superkey (the sole superkey being the entire heading), so the table does not satisfy the
Database_normalization
Database model
Superkey A superkey is a set of column headers for which the values of those columns concatenated are unique across all rows. Formally: A superkey is
Relational_model
Set of columns in a relational database
duplicate combinations of values. A candidate key is a minimal superkey, i.e., a superkey that does not contain a smaller one. Therefore, a relation can
Candidate_key
Normal form used in database normalization
conditions hold: X → Y is a trivial functional dependency (Y ⊆ X), X is a superkey for schema R. If a relational schema is in BCNF, then it is automatically
Boyce–Codd_normal_form
Normal form used in database normalization
multivalued dependencies X ↠ {\displaystyle \twoheadrightarrow } Y, X is a superkey—that is, X is either a candidate key or a superset thereof. If the column
Fourth_normal_form
Relational databases concept
primary key is a choice[clarification needed] of a candidate key (a minimal superkey); any other candidate key is an alternate key. In relational database terms
Primary_key
Level of database normalization
subset of X, meaning X → Y is a trivial functional dependency), X is a superkey, every element of Y \ X, the set difference between Y and X, is a prime
Third_normal_form
Database normalization
implied by the candidate key(s) of R if and only if each of A, B, …, Z is a superkey for R. The fifth normal form was first described by Ronald Fagin in his
Fifth_normal_form
Type of unique key in a database
domain of discourse). In the relational model of data, a natural key is a superkey and is therefore a functional determinant for all attributes in a relation
Natural_key
Defunct American software company
Turbo Pascal and Sidekick, the company launched other applications such as SuperKey and Lightning, all developed in Denmark. While the Danes remained majority
Borland
Digital database whose organization is based on the relational model of data
Because a tuple is unique, its attributes by definition constitute a superkey. All data are stored and accessed via relations. Relations that store data
Relational_database
Concept in database systems
ON UPDATE CASCADE ON DELETE RESTRICT ) Candidate key Compound key Superkey Junction table Coronel, Carlos (2010). Database Systems: Design, Implementation
Foreign_key
Relational database theory concept
Semester} The latter expresses the fact that the set {StudentID, Lecture} is a superkey of the relation. A classic example of functional dependency is the employee
Functional_dependency
Rule for substituting a set input with a set output
recorders. During the 1980s, macro programs – originally SmartKey, then SuperKey, KeyWorks, Prokey – were very popular, first as a means to automatically
Macro_(computer_science)
Topics referred to by the same term
key may refer to: Super key (keyboard button), modifier key on keyboards Superkey, database relation This disambiguation page lists articles associated with
Super_key
Function of managing and maintaining DBMS software
CAP theorem CRUD Null Candidate key Foreign key PACELC design principle Superkey Surrogate key Unique key Objects Relation table column row View Transaction
Database_administration
Identifier for a taxpaying entity in the United States
CAP theorem CRUD Null Candidate key Foreign key PACELC design principle Superkey Surrogate key Unique key Objects Relation table column row View Transaction
Taxpayer Identification Number
Taxpayer_Identification_Number
Synthetic unique identifier that communicates additional information
about the entity identified. The smart number is conceptually similar to a superkey as defined in the relational model of database organization, but, is intended
Smart_number
Processing program
never able to counter the marketing muscle of its largest competitor, SuperKey, a product of Borland International. SmartKey 6.0, the final version, was
SmartKey
Overview of and topical guide to databases
Candidate key – minimal superkey for a relation. Foreign key – referential constraint between two tables. Primary key – Superkey – set of attributes of
Outline_of_databases
Candidate key with two or more attributes in a database
database Alternate key Candidate key Foreign key Primary key Unique key Superkey Connolly, Thomas M.; Begg, Carolyn E. (2015). "12.3.4 Keys". Database systems:
Composite_key
Database form
functional, multi-valued or join dependencies that can be converted into superkeys. The domains on those normal forms were unconstrained so all domain constraints
Domain-key_normal_form
American professional wrestler
for almost two years until losing the titles to The SuperKeys (SuperKey #1 & SuperKey #2) in Jackson Center on April 1. Less than 24 hours after losing
Scotty_Summers
Full constraint between two sets of attributes in a relation
multivalued dependency X ↠ {\displaystyle \twoheadrightarrow } Y, X is a superkey. A multivalued dependency X ↠ {\displaystyle \twoheadrightarrow } Y is
Multivalued_dependency
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Girl/Female
English
Boy/Male
Muslim
Real brother
Surname or Lastname
English
English : probably a variant of Pinnock.
Boy/Male
Muslim
Successful
Girl/Female
Muslim
Real sister
Surname or Lastname
English (chiefly Lancashire)
English (chiefly Lancashire) : habitational name from a place near Chorley. Early forms consistently show the first syllable as Wer-, and the name is probably derived from Old English wer ‘weir’ + denu ‘valley’.
Girl/Female
American, British, Christian, Danish, English, German, Greek, Latin, Swedish
Follower of Christ; Christ-bearer; Anointed
Boy/Male
Australian, German, Turkish
Honor
Girl/Female
Hebrew English
Devoted to God.
Girl/Female
Tamil
Neetimati | நீதிமதா
Name of a Raga
SUPERKEY
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SUPERKEY