Foreign Key

A person, organization, or technical means that provides foreign intelligence or foreign counterintelligence and that, if its identity or capability is disclosed, is vulnerable to counteraction that could nullify or significantly reduce its effectiveness in providing foreign intelligence or foreign counterintelligence to the United States. An intelligence source also means a person or organization that provides foreign intelligence or foreign counterintelligence to the United States only on the condition that its identity remains undisclosed.
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The assurance that an object handle identifies a single object. The facility of a DBMS that ensures the validity of predefined relationships. Used to enforce relationships between two tables. One table in the relationship contains a foreign key that corresponds to the primary key of the other table in the relationship.
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The language mechanism that allows the definition of a class to include the attributes and methods for another more general class. Inheritance is an implementation construct for the specialization relation. The general class is the superclass and the specific class is the subclass in the inheritance relation. Inheritance is a relation between classes that enables the reuse of code and the definition of generalized interface to one or more subclasses.
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A relation the user creates to eliminate a manytomany relationship. Also called a composite relation.
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A database that consists of tables that contain a set of related records. In a relational database, data is organized in twodimensional tables or relations.
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