Computer Science for IGCSE & O level - Databases (Section 5 - No. 12) | ExamPlay

Computer Science for IGCSE & O level - Databases (Section 5 - No. 12)

In SQL, what does the term 'NULL' represent?

Zero

An empty string.

A missing or unknown value.

A space.

Giải thích

'NULL' represents the absence of a value in a field.

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