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
- 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.
Quiz of this Question