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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 ...
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.
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 ...
The hyperpersonal model is a model of interpersonal communication that suggests computer-mediated communication (CMC) can become hyperpersonal because it "exceeds [face-to-face] interaction", thus affording message senders a host of communicative advantages over traditional face-to-face (FtF) interaction. [1]
This was the first time the notion of a relational database was published. All work after this, including the Boyce–Codd normal form method was based on this relational model. The Boyce–Codd normal form was first described by Ian Heath in 1971, and has also been called Heath normal form by Chris Date. [1]
There is high importance also on the "processes between people take the form of rule-governed patterns of interactions and that there is logic to the way the we act in communication". [2] There are also rules and stigmas that vary in cultures when we disclose information or communicate in the ways we are socially taught when assigning meaning ...
Many models of communication include the idea that a sender encodes a message and uses a channel to transmit it to a receiver. Noise may distort the message along the way. The receiver then decodes the message and gives some form of feedback. [1] Models of communication simplify or represent the process of communication.
But there are also many non-verbal communication skills, like the encoding skills of drawing and gesturing. [8] [36] Berlo sees thought or reasoning as an additional communication skill relevant both to encoding and decoding. [37] The communication skills required for successful communication are different for source and receiver.