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Что (кто) такое functional dependency - определение
Functional dependency
IN RELATIONAL DATABASE THEORY, A CONSTRAINT BETWEEN TWO SETS OF ATTRIBUTES IN A RELATION FROM A DATABASE
Fundep; Functional dependencies; Heath's theorem; Functional Dependency
In relational database theory, a functional dependency is a constraint between two sets of attributes in a relation from a database. In other words, a functional dependency is a constraint between two attributes in a relation.
functional dependency
IN RELATIONAL DATABASE THEORY, A CONSTRAINT BETWEEN TWO SETS OF ATTRIBUTES IN A RELATION FROM A DATABASE
Fundep; Functional dependencies; Heath's theorem; Functional Dependency
<database> Given a relation R (in a relational database),
attribute Y of R is functionally dependent on attribute X of R
and X of R functionally determines Y of R (in symbols R.X ->
R.Y) if and only if each X in R has associated with it
precisely one Y in R (at any one time). Attributes X and Y
may be composite.
This is very close to a function in the mathematical sense.
(1997-09-01)
Media system dependency theory
1976 THEORY DEVELOPED BY SANDRA BALL-ROKEACH AND MELVIN DEFLEUR
Media system dependency; Media-system dependency; Media Systems Dependency Theory; Media systems dependency theory; Media dependency
Media system dependency theory (MSD), or simply media dependency, was developed by Sandra Ball-Rokeach and Melvin Defleur in 1976. The theory is grounded in classical sociological literature positing that media and their audiences should be studied in the context of larger social systems.
