An attribute in a relation is a foreign key if the _______ key from one relation is used as an attribute in that relation.a.Superb.Primaryc.Candidated.unique
Question
An attribute in a relation is a foreign key if the _______ key from one relation is used as an attribute in that relation.
- a. Superb
- b. Primary
- c. Candidate
- d. Unique
Solution
The correct answer is b. Primary.
A foreign key in a relational database is an attribute (or a set of attributes) that creates a link between two tables. It is defined in one table as a reference to the primary key of another table. This relationship helps maintain referential integrity within the database.
To clarify:
- Primary Key: A unique identifier for a record in a table.
- Foreign Key: An attribute in one table that is a primary key in another table.
Thus, an attribute in a relation is a foreign key if the primary key from one relation is used as an attribute in that relation.
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