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1. The Free On-line Dictionary of Computing (30 December 2018) |
database normalisation
1NF
2NF
3NF
4NF
5NF
Codd's First Normal Form
fifth normal form
first normal form
fourth normal form
second normal form
third normal form
A series of steps followed to obtain a database
design that allows for efficient access and storage of data
in a relational database. These steps reduce data
redundancy and the chances of data becoming inconsistent.
A table in a relational database is said to be in normal
form if it satisfies certain constraints. Codd's original
work defined three such forms but there are now five generally
accepted steps of normalisation. The output of the first step
is called First Normal Form (1NF), the output of the second
step is Second Normal Form (2NF), etc.
First Normal Form eliminates repeating groups by putting
each value of a multi-valued attribute into a new row.
Second Normal Form eliminates functional dependencies on a
partial key by putting the fields in a separate table from
those that are dependent on the whole key.
Third Normal Form eliminates functional dependencies on
non-key fields by putting them in a separate table. At this
stage, all non-key fields are dependent on the key, the whole
key and nothing but the key.
Fourth Normal Form separates independent multi-valued facts
stored in one table into separate tables.
Fifth Normal Form breaks out data redundancy that is not
covered by any of the previous normal forms.
<http://bkent.net/Doc/simple5.htm>.
[What about non-relational databases?]
(2005-07-28)
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2nf n2nf n2f 2n2f nf 22nf 2fn 2nfn 2f 2nnf 2fnf 2n 2nff @nf 2@nf @2nf 1nf 21nf 12nf 3nf 23nf 32nf qnf 2qnf q2nf wnf 2wnf w2nf enf 2enf e2nf 2gf 2ngf 2gnf 2hf 2nhf 2hnf 2jf 2njf 2jnf 2bf 2nbf 2bnf 2mf 2nmf 2mnf 2 f 2n f 2 nf 2ne 2nfe 2nef 2nr 2nfr 2nrf 2nt 2nft 2ntf 2nd 2nfd 2ndf 2ng 2nfg 2ngf 2nc 2nfc 2ncf 2nv 2nfv 2nvf 2nb 2nfb 2nbf 2n 2nf 2n f Definition commonly spelled as: Defanition or Defenition, Synonym as: Synonim, Sinonym or Sinonim, Thesaurus as: Thesorus or Thesauris, Dictionary as: Dictionery or Dictionry and Define is usually not misspelled. What does mispell meen? It Meens...
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