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1.5.4 Dritte Normalform (3NF) (1|5)

wenn jedes NSA von jedem Schlüssel direkt abhängig ist; d.h.:. r in 3NF :   NSA a  Schl. K:  ( K a (r))   NSA a  Schl. K: K a (r). Somit gilt entsprechend: r nicht in 3NF   NSA a  Schl. K: K a (r). 1.5.4 Dritte Normalform (3NF) (1|5).

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1.5.4 Dritte Normalform (3NF) (1|5)

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  1. wenn jedes NSA von jedem Schlüsseldirekt abhängig ist; d.h.: r in 3NF :  NSA a  Schl. K:  (K a (r))   NSA a  Schl. K: K a (r) Somit gilt entsprechend: r nicht in 3NF  NSA a  Schl. K: K a (r) 1.5.4 Dritte Normalform (3NF) (1|5) • Definition: • Eine 1NF-Relation ist in der dritten Normalform (3NF), wenn kein Nichtschlüsselattribut von (irgend)einemSchlüsseltransitiv abhängig ist; m.a.W.: Relationentheorie Ó AIFB

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