Question

A ________ value is a special field value, distinct from a zero, blank, or any other value, that indicates that the value for the field is missing or otherwise unknown.

A) Key
B) True
C) Null
D) Default

Answer 1

The correct answer is C) Null, which is used in databases to indicate that a field value is missing or unknown, distinguishing it from values like zero or blank.

Step-by-step explanation:

A null value is a special field value, distinct from a zero, blank, or any other value, that indicates that the value for the field is missing or otherwise unknown. The correct answer to the question is C) Null.

In database management systems, a null value represents the absence of any data in a field. It is used to indicate that the information is either not applicable, has not been collected, or simply does not exist. This is a crucial concept in databases, as it allows for the differentiation between a field that is intentionally left empty and one that should contain a value but does not for some reason.