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A candidate key is a minimal superkey, [1] i.e., a superkey that does not contain a smaller one. Therefore, a relation can have multiple candidate keys, each with a different number of attributes. [2] Specific candidate keys are sometimes called primary keys, secondary keys or alternate keys.
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 ...
The law is, in a strict sense, only about correspondence; it does not state that communication structure is the cause of system structure, merely describes the connection. Different commentators have taken various positions on the direction of causality; that technical design causes the organization to restructure to fit, [ 10 ] that the ...
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.
MARC - MAchine Readable Cataloging – standards for the representation and communication of bibliographic and related information in machine-readable form. METS [31] Librarianship: Metadata Encoding and Transmission Standard is an XML schema for encoding descriptive, administrative, and structural metadata regarding objects within a digital ...
Text linguistics is a branch of linguistics that deals with texts as communication systems.Its original aims lay in uncovering and describing text grammars.The application of text linguistics has, however, evolved from this approach to a point in which text is viewed in much broader terms that go beyond a mere extension of traditional grammar towards an entire text.
Message design logic is a communication theory that makes the claim that individuals possess implicit theories of communication within themselves, called message design logics. [1] Referred to as a “theory of theories,” Message Design Logic offers three different fundamental premises in reasoning about communication . [ 2 ]
By hypothesis, I-language—also called universal grammar—corresponds to the initial state of the human language faculty in individual human development. Minimalism is reductive in that it aims to identify which aspects of human language—as well the computational system that underlies it—are conceptually necessary.