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A relation is in first normal form if and only if no attribute domain has relations as elements. [1] Or more informally, that no table column can have tables as values. Database normalization is the process of representing a database in terms of relations in standard normal forms, where first normal is a minimal requirement.
Codd went on to define the second normal form (2NF) and third normal form (3NF) in 1971, [5] and Codd and Raymond F. Boyce defined the Boyce–Codd normal form (BCNF) in 1974. [6] Ronald Fagin introduced the fourth normal form (4NF) in 1977 and the fifth normal form (5NF) in 1979. Christopher J. Date introduced the sixth normal form (6NF) in 2003.
Normal form may refer to: Normal form (databases) Normal form (game theory) Canonical form; Normal form (dynamical systems) Hesse normal form; Normal form in music;
A rewriting system has the unique normal form property (UN) if for all normal forms a, b ∈ S, a can be reached from b by a series of rewrites and inverse rewrites only if a is equal to b. A rewriting system has the unique normal form property with respect to reduction (UN →) if for every term reducing to normal forms a and b, a is equal to ...
First normal form; Second normal form; Third normal form; Fourth normal form; Fifth normal form; Sixth normal form; A. Anchor modeling; Armstrong's axioms; B. Boyce ...
It is sufficient to say 'First normal form is a property of a relation', and reference the normal forms section later, for further reading. - Crosbie 18:43, 21 March 2013 (UTC) [ reply ] Statement of First Normal Form is Too Narrow
In computer science, A-normal form (abbreviated ANF, sometimes expanded as administrative normal form or as atomic normal form) is an intermediate representation of programs in functional programming language compilers. In ANF, all arguments to a function must be trivial (constants or variables). That is, evaluation of each argument must halt ...
A normal form for a free group with generating set is a choice of a reduced word in for each element of . Normal Form Theorem for Free Groups. A free group has a unique normal form i.e. each element in is represented by a unique reduced word. Proof.
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