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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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4nf n4nf n4f 4n4f nf 44nf 4fn 4nfn 4f 4nnf 4fnf 4n 4nff 3nf 43nf 34nf #nf 4#nf #4nf 5nf 45nf 54nf enf 4enf e4nf rnf 4rnf r4nf tnf 4tnf t4nf 4gf 4ngf 4gnf 4hf 4nhf 4hnf 4jf 4njf 4jnf 4bf 4nbf 4bnf 4mf 4nmf 4mnf 4 f 4n f 4 nf 4ne 4nfe 4nef 4nr 4nfr 4nrf 4nt 4nft 4ntf 4nd 4nfd 4ndf 4ng 4nfg 4ngf 4nc 4nfc 4ncf 4nv 4nfv 4nvf 4nb 4nfb 4nbf 4n 4nf 4n 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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