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Que. 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 AND not(not(x = 5))
b. x = 5 AND x> 4 and x < 6, where x is an integer
c. x < 5 AND not (x = 5)
d. None of the above
Answer:x < 5 AND not (x = 5)
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