Q2.26

MCQ2 marks, −0.5

In SQL, relations can contain null values, and comparisons with null values are treated as unknown. Suppose all comparisons with a null value are treated as false. Which of the following pairs is not equivalent?

(A)

$x = 5 \quad not (not (x = 5))$

(B)

$x = 5 \quad x > 4$ and $x < 6,$ where $x$ is an integer

(C)

$x ≠ 5 \quad not (x = 5)$

(D)

none of the above

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