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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