Question
DBMS Question on Database Introduction
Consider the following statements:
(A) Each attribute in a relation has a unique name
(B) All data values in an attribute must be from the same domain
(C) A special value NULL is used to represent values that are unknown
(D) A database constraint allow different types of data to inserted into the table
Choose the correct answer from the options given below:
A
(A), (B) and (C) only
B
(A), (B) only
C
(A), (C), (D) only
D
(A), (B), (C) and (D) only
Answer
(A), (B) and (C) only
Explanation
Solution
The correct option is(A): (A), (B) and (C) only