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2. Superkey - Wikipedia

   en.wikipedia.org/wiki/Superkey

   A candidate key (or minimal superkey) is a superkey that can't be reduced to a simpler superkey by removing an attribute. [ 3 ] For example, in an employee schema with attributes employeeID , name , job , and departmentID , if employeeID values are unique then employeeID combined with any or all of the other attributes can uniquely identify ...

3. Candidate key - Wikipedia

   en.wikipedia.org/wiki/Candidate_key

   A candidate key, or simply a key, of a relational database is any set of columns that have a unique combination of values in each row, with the additional constraint that removing any column could produce duplicate combinations of values. A candidate key is a minimal superkey, [1] i.e., a superkey that does not contain a smaller one. Therefore ...

4. Super key (keyboard button) - Wikipedia

   en.wikipedia.org/wiki/Super_key_(keyboard_button)

   A Super key, located between the Control key and the Alt key, on an ISO style PC keyboard. Super key ( ) is an alternative name for what is commonly labelled as the Windows key [1] or Command key [2] on modern keyboards, typically bound and handled as such by Linux and BSD operating systems and software today.

5. Super key - Wikipedia

   en.wikipedia.org/wiki/Super_key

   Upload file; Search. Search. Appearance. Donate; ... Super key may refer to: Super key (keyboard button), modifier key on keyboards; Superkey, database relation

6. Domain-key normal form - Wikipedia

   en.wikipedia.org/wiki/Domain-key_normal_form

   Domain-key normal form (DK/NF or 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 key constraint specifies the attributes that uniquely identify a ...

7. Second normal form - Wikipedia

   en.wikipedia.org/wiki/Second_normal_form

   Second normal form (2NF), in database normalization, is a normal form. 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