UGC NET June-2019 CS Paper-2

Question 7

Which of the following key constraints is required for functioning of foreign key in the context of relational database?

A	Unique key
B	Primary key
C	candidate key
D	Check key

Database-Management-SystemConstraints

Question 7 Explanation:

Foreign key is a key whose values depends on the primary key of a relation. So for the functioning of a foreign key in the context of relational database we need a primary key.

Correct Answer: B

Question 7 Explanation:

Foreign key is a key whose values depends on the primary key of a relation. So for the functioning of a foreign key in the context of relational database we need a primary key.