UGC-NET | UGC NET CS 2016 July – II | Question 16

In RDBMS, the constraint that no key attribute (column) may be NULL is referred to as:
(A) Referential integrity
(B) Multi-valued dependency
(C) Entity Integrity
(D) Functional dependency

Answer: (C)
Explanation:

In RDBMS, the constraint that no key attribute (column) may be NULL is referred to as Entity Interity
Referential integrity states that table relationships must always be consistent.
Multi-valued dependencyis a full constraint between two sets of attributes in a relation
Functional dependency is a relationship that exists when one attribute uniquely determines another attribute.

So, option (C) is correct.
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