Online GK Series

This site is dedicated to the aspirants of competitive exams SSC, UPSC, Railways, Postal Assistants, Bank, GATE and NET


A primary key :

A is also referred to as a composite key
B is a unique identifier in a column
C uniquely identities the data in row
D must be accompanied by a corresponding foreign key
Answer & Explanation
Option: [B]

Your Valuable Comments Please...

Useful Computer Science EBooks