# Second Normal Form

Second Normal Form
Mathematics: 2NF

Универсальный русско-английский словарь. . 2011.

Нужен реферат?

### Смотреть что такое "Second Normal Form" в других словарях:

• Second normal form — (2NF) is a normal form used in database normalization. 2NF was originally defined by E.F. CoddCodd, E.F. Further Normalization of the Data Base Relational Model. (Presented at Courant Computer Science Symposia Series 6, Data Base Systems, New… …   Wikipedia

• second normal form — noun A stage in the normalization of a relational database in which it is in first normal form and every non key attribute is dependent upon the entire primary key. See Also: first normal form …   Wiktionary

• Second fundamental form — In differential geometry, the second fundamental form is a quadratic form on the tangent plane of a smooth surface in the three dimensional Euclidean space, usually denoted by II. Together with the first fundamental form, it serves to define… …   Wikipedia

• First normal form — (1NF or Minimal Form) is a normal form used in database normalization. A relational database table that adheres to 1NF is one that meets a certain minimum set of criteria. These criteria are basically concerned with ensuring that the table is a… …   Wikipedia

• Third normal form — The third normal form (3NF) is a normal form used in database normalization. 3NF was originally defined by E.F. CoddCodd, E.F. Further Normalization of the Data Base Relational Model. (Presented at Courant Computer Science Symposia Series 6, Data …   Wikipedia

• fifth normal form — noun A stage in the normalization of a relational database in which a database is in fourth normal form and every join dependency is implied by the candidate keys. See Also: first normal form …   Wiktionary

• third normal form — noun A stage in the normalization of a relational database in which a database is in second normal form and all non key attributes are mutually independent (no transient dependencies.) See Also …   Wiktionary

• fourth normal form — noun A stage in the normalization of a relational database in which a database is in Boyce Codd normal form and all multi valued dependencies are functional dependencies. See Also: first normal form, second normal form, third normal form …   Wiktionary

• first normal form — noun A stage in the normalization of a relational database in which repeating groups and attributes have been eliminated by putting each into a separate table connected by a primary key foreign key relationship. See Also: second normal form …   Wiktionary

• Normal-form game — In game theory, normal form is a way of describing a game. Unlike extensive form, normal form representations are not graphical per se, but rather represent the game by way of a matrix. While this approach can be of greater use in identifying… …   Wikipedia

• Domain/key normal form — (DKNF) is a normal form used in database normalization which requires that the database contains no constraints other than domain constraints and key constraints. A domain constraint specifies the permissible values for a given attribute, while a …   Wikipedia

### Поделиться ссылкой на выделенное

##### Прямая ссылка:
Нажмите правой клавишей мыши и выберите «Копировать ссылку»