What Is A Foreign Key #566
What is a foreign key?
This multiple choice question (MCQ) is related to the book/course gs gs114 Relational Database Management System. It can also be found in gs gs114 Introduction to Relational Model and SQL - Introduction to the Relational Model - Quiz No.1.
What is a foreign key?
A foreign key is a primary key of a relation which is an attribute in another relation
A foreign key is a superkey of a relation which is an attribute in more than one other relations
A foreign key is an attribute of a relation that is a primary key of another relation
A foreign key is the primary key of a relation that does not occur anywhere else in the schema