To answer this question, we need to understand the syntax and usage of the TO_CHAR function in Oracle.
The TO_CHAR function is used to convert a number or date to a character string. It takes two arguments: the number or date to be converted and the format model specifying the desired format of the output.
Let's go through each option to understand why it is correct or incorrect:
Option A) SELECT TO_CHAR(2000, '$#,###.##') from dual
This option is incorrect because the format model '#,###.##' does not include the necessary formatting for the dollar sign and the required number of digits before and after the decimal point.
Option B) SELECT TO_CHAR(2000, '$0,000.00') from dual
This option is correct because the format model '$0,000.00' specifies the dollar sign, the thousands separator, and two decimal places, which matches the required format.
Option C) SELECT TO_CHAR(2000, '$9,999.00') from dual
This option is correct because the format model '$9,999.00' specifies the dollar sign, the thousands separator, and two decimal places. The '9' in the format model allows for the possibility of leading zeros.
Option D) SELECT TO_CHAR(2000, '$9,999.99') from dual
This option is correct because the format model '$9,999.99' specifies the dollar sign, the thousands separator, and two decimal places. The '9' in the format model allows for the possibility of leading zeros.
Option E) SELECT TO_CHAR(2000, '$2,000.00') FROM dual;
This option is incorrect because it specifies the exact value that needs to be displayed, rather than using a format model to convert the number to the desired format.
Option F) SELECT TO_CHAR(2000, '$N,NNN.NN') FROM dual;
This option is incorrect because the format model '$N,NNN.NN' is not a valid format model in Oracle.
The correct answers are B, C, and D. These options provide the correct format for displaying 2000 as "$2,000.00".