A foreign key is an attribute that is required to exist in each table of a relational database and serves as the unique identifier for each record in a table.

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A foreign key is not a unique identifier for each record in a table, but rather a field that creates a relationship between two tables by referencing the primary key of another table. It is not required for each table in a relational database to have a foreign key.

A Foreign Key Is an Attribute That Is Required to Exist