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SQL
Question

What is the output of: SELECT NULL = NULL in SQL?

SQL Hard

Select the correct answer: Single Choice

Explanation

In SQL, comparing NULL to NULL using the "=" operator results in an unknown value, not TRUE or FALSE. This is because NULL represents an unknown value, so the comparison cannot determine equality.

Common mistake

Confusing NULL with a specific value like TRUE or FALSE.

Exam tip

Remember that NULL represents an unknown value in SQL, so comparisons involving NULL can result in unexpected outcomes.

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