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19 relations: Array data structure, Christopher J. Date, Column (database), Data domain, Database normalization, Edgar F. Codd, Hugh Darwen, International Standard Book Number, Isomorphism, Null (SQL), Relation (database), Relational database, Relational model, Second normal form, SQL, SQL:2003, Third normal form, Tuple, View (SQL).
Array data structure
In computer science, an array data structure, or simply an array, is a data structure consisting of a collection of elements (values or variables), each identified by at least one array index or key.
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Christopher J. Date
Chris Date (born 1941) is an independent author, lecturer, researcher, and consultant, specializing in relational database theory.
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Column (database)
In a relational database, a column is a set of data values of a particular simple type, one value for each row of the database.
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Data domain
In data management and database analysis, a data domain refers to all the values which a data element may contain.
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Database normalization
Database normalization is the process of restructuring a relational database in accordance with a series of so-called normal forms in order to reduce data redundancy and improve data integrity.
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Edgar F. Codd
Edgar Frank "Ted" Codd (19 August 1923 – 18 April 2003) was an English computer scientist who, while working for IBM, invented the relational model for database management, the theoretical basis for relational databases and relational database management systems.
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Hugh Darwen
Hugh Darwen is a computer scientist who was an employee of IBM United Kingdom from 1967.
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International Standard Book Number
The International Standard Book Number (ISBN) is a unique numeric commercial book identifier.
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Isomorphism
In mathematics, an isomorphism (from the Ancient Greek: ἴσος isos "equal", and μορφή morphe "form" or "shape") is a homomorphism or morphism (i.e. a mathematical mapping) that can be reversed by an inverse morphism.
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Null (SQL)
Null (or NULL) is a special marker used in Structured Query Language to indicate that a data value does not exist in the database.
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Relation (database)
In relational 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 domain.
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Relational database
A relational database is a digital database based on the relational model of data, as proposed by E. F. Codd in 1970.
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Relational model
The relational model (RM) for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd, where all data is represented in terms of tuples, grouped into relations.
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Second normal form
Second normal form (2NF) is a normal form used in database normalization.
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SQL
SQL (S-Q-L, "sequel"; Structured Query Language) is a domain-specific language used in programming and designed for managing data held in a relational database management system (RDBMS), or for stream processing in a relational data stream management system (RDSMS).
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SQL:2003
SQL:2003 is the fourth revision of the SQL database query language.
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Third normal form
Third normal form (3NF) is a normal form that is used in normalizing a database design to reduce the duplication of data and ensure referential integrity by ensuring that (1) the entity is in second normal form, and (2) all the attributes in a table are determined only by the candidate keys of that relation and not by any non-prime attributes.
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Tuple
In mathematics, a tuple is a finite ordered list (sequence) of elements.
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View (SQL)
In a database, a view is the result set of a stored query on the data, which the database users can query just as they would in a persistent database collection object.
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