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NULL is

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NULL is

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Correct Answer: Option D
NULL in SQL is used to represent missing or unknown data. It is not the same as 0 for integer or blank for character. In fact, NULL is not a specific value, but rather an absence of a value or a placeholder for missing data.

So, the correct answer is Option D: not a value.
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1 Comment
Ahashan Imon
Ahashan Imon 7 years ago
Null is a value that is unavailable, unassigned, unknown or inapplicable. Null is not same as zero or a blank space.
Oracle Database Fundamentals I, Volume I, Page 1-14
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