Multiple choice technology

What is the result if two NULL values are compared to each other?

  1. True

  2. False

  3. Undefined

  4. NULL
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

To solve this question, the user needs to understand the concept of NULL values and how they behave in comparison operations.

When two NULL values are compared to each other, the result is always NULL. This is because NULL represents an unknown value, so it is impossible to determine whether two unknown values are equal or not.

Now, let's go through each option and explain why it is right or wrong:

A. True: This option is incorrect because comparing two NULL values will always result in a NULL value, not a true value.

B. False: This option is incorrect because comparing two NULL values will always result in a NULL value, not a false value.

C. Undefined: This option is incorrect because NULL is a defined value in SQL, and the result of comparing two NULL values is also a defined value (NULL).

D. NULL: This option is correct. Comparing two NULL values will always result in a NULL value.

Therefore, the answer is: D. NULL

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