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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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5nf n5nf n5f 5n5f nf 55nf 5fn 5nfn 5f 5nnf 5fnf 5n 5nff %nf 5%nf %5nf 4nf 54nf 45nf 6nf 56nf 65nf rnf 5rnf r5nf tnf 5tnf t5nf ynf 5ynf y5nf 5gf 5ngf 5gnf 5hf 5nhf 5hnf 5jf 5njf 5jnf 5bf 5nbf 5bnf 5mf 5nmf 5mnf 5 f 5n f 5 nf 5ne 5nfe 5nef 5nr 5nfr 5nrf 5nt 5nft 5ntf 5nd 5nfd 5ndf 5ng 5nfg 5ngf 5nc 5nfc 5ncf 5nv 5nfv 5nvf 5nb 5nfb 5nbf 5n 5nf 5n 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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