Database normalization
... when reaching 3NF are also in BCNF. 4NF and 5NF are further extensions, and 6NF ... Fourth normal form Fourth normal form (or 4NF) requires that there are no non-trivial ... A table is said to be in 4NF if and only if it is in ... multi-valued dependencies are functional dependencies. The 4NF removes unwanted data structures: multi-valued dependencies ... retrieval. Therefore this table is not in 4NF. There are actually two distinct many- ...
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Talk:Database normalization
... be reached in a dependency preserving way. 4NF example how to transform from BCNF to 4NF Multi-valued and join dependencies def Given ... between JDs and MVDs 5NF example from 4NF to 5NF explain that ultimate normal form ... the key constraints. 1NF, 2NF, 3NF, BCNF, 4NF, 5NF are all subsets of the general ... 35, 2 Jun 2005 (UTC) Problem with 4NF example I'm not convinced by ...
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Normalization (data base)   (translated from German)
... six standard formats (1NF, 2NF, 3NF, BCNF, 4NF, 5NF). In the course of the mathematical ... relations are in BCNF. Fourth standard format (4NF) The 4. Standard format describes multi-valued ... Ferrari 2 Dog Porsche Injury of the 4NF To a person number gibts it several ... can we this table up into the 4NF split. Solution Domestic animal Person number Domestic ... 1 Ferrari 2 Porsche Reference In the 4NF the following relation would be correct: ...
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Normalization of data   (translated from Portuguese)
... like A->A). Fourth Normal Form (or 4NF) requires that there in non-trivial multi ... and MVDs Normal Fourth Form definition of 4NF example how you transform from BCNF you the 4NF Normal Fifth Form def of 5NF example from 4NF you the 5NF explain that ultimate normal ...
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Normalization (Databasemanagement wiki)
... is a candidate key. Fourth Normal Form (4NF) Issues with 4NF occur when a relation is in BCNF ... smaller cohesive tables. Usually a table in 4NF is considered to be in 5NF, but ...
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Formalization of relation   (translated from Japanese)
... ボイス・コッド正規形は、ほとんどの場合第3正規形と等価であり、複数の属性からなる候補キーが複数存在する場合にのみ差異が生じうる。第3正規形は非キー属性を従属項とする関数従属性だけを問題とするので、候補キーを構成する属性の間に候補キーを決定項としない関数従属性が存在することを許す。ボイス・コッド正規形では、この問題が存在することを許さない。ボイス・コッド正規形は、いわば第3正規形をより完全にしたものである。 第3正規形のリレーションは、常に無損失なようにボイス・コッド正規形に分解することができるが、無損失かつ独立なように分解できるとは限らない。これが実務上、正規化を第3正規形に止めることが多い理由の一つである。 第4正規形 第4正規形 (fourth normal form; 4NF) では候補キーではない属性への多値従属性をもった属性があってはならない。 第5正規形 第5正規形 (fifth normal form; 5NF ...
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User talk:157.159.43.34
... top. Is there something special about the 4NF that I missed? — (Talk) 17:12 ...
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UK railway stations - L
... Longniddry EH32 0LS LND Timetable Longport ST6 4NF LPT Timetable Longton ST3 2JG LGN Timetable ...
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List of computing topics
... 431A -- 473L Query programming language -- 486SX -- 4GL -- 4NF -- 51forth programming language -- 56 kbit/s -- 56 ...
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