A foreign key must be added to at least one of the tables when using the relational model.

Name: A foreign key must be added to at least one of the tables when using the relational model.
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In the relational model, a foreign key is used to create a relationship between two tables. It references a primary key in another table, which creates a link between the two. Therefore, at least one table must have a foreign key in order to establish these relationships.

A Foreign Key Must Be Added to at Least One