To solve this question, the user needs to know the syntax for calculating the absolute value in SQL. The ABS function can be used to calculate the absolute value of a number.
Now, let's go through each option and explain why it is right or wrong:
A. SELECT ABS(-33) "Absolute" FROM DUAL;
This option is correct. The ABS function is used to calculate the absolute value of a number, and the syntax in this statement is correct. The "Absolute" alias is used to rename the column with the calculated value.
B. SELECT ABS(-33), Absolute FROM DUAL;
This option is incorrect. The "Absolute" alias is not defined in the statement. Additionally, the ABS function is used correctly.
C. SELECT ABS("-33") Absolute FROM DUAL;
This option is incorrect. The quotation marks around the number indicate that it is a string, not a number. The ABS function cannot calculate the absolute value of a string.
D. None of these
This option is incorrect. Option A is the correct answer.
The Answer is: A