What is a foreign key?
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A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables.
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In the context of relational databases, a foreign key is a set of attributes subject to a certain kind of inclusion dependency constraint, specifically a constraint that the tuples consisting of the .
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A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables. It acts as a cross-reference between tables because it references the primary key of another table, thereby establishing a link between them
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