Practice Paper Computer Knowledge-Networking

Practice Paper Computer Knowledge-Networking Question Set-1
Question 1: Which one of the following operation is commutative but not associative?
1. OR
2. NAND

Previous questions with answers of the Professional Knowledge paper of I.T. Officers Specialist Officers of Banks

Previous questions with answers of the Professional Knowledge paper of I.T. Officers/Specialist Officers of Banks.   

1. The _____ states that a foreign key must either match a primary key value in another relation or it must be null.