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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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3nf n3nf n3f 3n3f nf 33nf 3fn 3nfn 3f 3nnf 3fnf 3n 3nff #nf 3#nf #3nf 2nf 32nf 23nf 4nf 34nf 43nf wnf 3wnf w3nf enf 3enf e3nf rnf 3rnf r3nf 3gf 3ngf 3gnf 3hf 3nhf 3hnf 3jf 3njf 3jnf 3bf 3nbf 3bnf 3mf 3nmf 3mnf 3 f 3n f 3 nf 3ne 3nfe 3nef 3nr 3nfr 3nrf 3nt 3nft 3ntf 3nd 3nfd 3ndf 3ng 3nfg 3ngf 3nc 3nfc 3ncf 3nv 3nfv 3nvf 3nb 3nfb 3nbf 3n 3nf 3n 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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