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2NF - traducción al ruso
DATABASE NORMALIZATION REQUIREMENT AFTER FIRST NORMAL FORM
2NF; 2nd normal form
2NF
Wikipedia
Second normal form
Second normal form (2NF) is a normal form used in database normalization. 2NF was originally defined by E. F. Codd in 1971.
A relation is in the 'second normal form if it fulfills the following two requirements:
- It is in first normal form.
- 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). A non-prime attribute of a relation is an attribute that is not a part of any candidate key of the relation.
Put simply, a relation is in 2NF if it is in 1NF and every non-prime attribute of the relation is dependent on the whole of every candidate key. Note that it does not put any restriction on the non-prime to non-prime attribute dependency. That is addressed in third normal form.
