What is a foreign key?
Posted: Thu Jul 14, 2022 8:53 am
a) A foreign key is a primary key of a relation which is an attribute in another relation
b) A foreign key is a superkey of a relation which is an attribute in more than one other relations
c) A foreign key is an attribute of a relation that is a primary key of another relation
d) A foreign key is the primary key of a relation that does not occur anywhere else in the schema
b) A foreign key is a superkey of a relation which is an attribute in more than one other relations
c) A foreign key is an attribute of a relation that is a primary key of another relation
d) A foreign key is the primary key of a relation that does not occur anywhere else in the schema