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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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1nf n1nf n1f 1n1f nf 11nf 1fn 1nfn 1f 1nnf 1fnf 1n 1nff !nf 1!nf !1nf 2nf 12nf 21nf qnf 1qnf q1nf 1gf 1ngf 1gnf 1hf 1nhf 1hnf 1jf 1njf 1jnf 1bf 1nbf 1bnf 1mf 1nmf 1mnf 1 f 1n f 1 nf 1ne 1nfe 1nef 1nr 1nfr 1nrf 1nt 1nft 1ntf 1nd 1nfd 1ndf 1ng 1nfg 1ngf 1nc 1nfc 1ncf 1nv 1nfv 1nvf 1nb 1nfb 1nbf 1n 1nf 1n 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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