Question
Database Management Systems Question on Integrity constraints
Which two constraints when applied together will produce a primary key constraint ?
(A) NOT NULL
(B) UNIQUE
(C) DEFAULT
(D) ZERO
Choose the correct answer from the options given below:
A
(B) only
B
(B) and (D) only
C
(A), (B) and (C) only
D
(A) and (B) only
Answer
(A) and (B) only
Explanation
Solution
The correct option is(D): (A) and (B) only