Question

Null value is the special value which represents :

• A. Stores value items
• B. Data with many values
• C. Absence of data items
• D. Single value data item

Hint:

NULL is a fundamental concept in databases. Remember NULL is not the same as 0 (zero) or an empty string (''). It means 'no value', 'missing', or 'unknown'.

Answer 1

The Correct Option is C

Step 1: Understand NULL in Databases/Computing:
In database management and computing, NULL is a special marker used to indicate that a data value does not exist in the database for a particular field or attribute. It is different from a zero value (0) or an empty string ("").
Step 2: Evaluate Options:
(A) Stores value items: NULL represents the opposite - no value.
(B) Data with many values: NULL represents a single state - absence.
(C) Absence of data items: This accurately describes the meaning of NULL - that the value is missing or unknown.
(D) Single value data item: NULL represents the lack of a value.
Conclusion:
Null value specifically represents the absence of a data item or value in a field.