Second Normal Form

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HN55NSK19E0
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Geliefert zwischen Fr., 27.02.2026 und Mo., 02.03.2026

Details

Second normal form (2NF) is a normal form used in database normalization. 2NF was originally defined by E.F. Codd in 1971. A table that is in first normal form (1NF) must meet additional criteria if it is to qualify for second normal form. Specifically: a 1NF table is in 2NF if and only if, given any candidate key K and any attribute A that is not a constituent of a candidate key, A depends upon the whole of K rather than just a part of it. In slightly more formal terms: a 1NF table is in 2NF if and only if all its non-prime attributes are functionally dependent on the whole of every candidate key. (A non-prime attribute is one that does not belong to any candidate key.) Note that when a 1NF table has no composite candidate keys (candidate keys consisting of more than one attribute), the table is automatically in 2NF.

Weitere Informationen

  • Allgemeine Informationen
    • GTIN 09786137908075
    • Editor Saul Eadweard Helias
    • Auflage Aufl.
    • Größe H220mm x B220mm
    • EAN 9786137908075
    • Titel Second Normal Form
    • Untertitel Database Normalization, First Normal Form
    • Herausgeber Betascript Publishing
    • Anzahl Seiten 68
    • Genre Informatik

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