• A normal form used in database normalization. A relation is in the second normal form if it fulfills the following two requirements: 1) It is in first normal form. 2) It does not have any non-prime attribute that is functionally dependent on any proper subset of any candidate key of the relation (i.e., it lacks partial dependencies). 2NF was defined in 1971 by Edgar F. Codd. ← Wikipedia

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