A foreign key is a primary key of a relation that also is a primary key in another relation.

Name: A foreign key is a primary key of a relation that also is a primary key in another relation.
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A foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table. It is not necessarily a primary key in the other table, but it references the primary key of the other table.

A Foreign Key Is a Primary Key of a Relation