Final answer:
No, the TO_DATE function is not needed to calculate the difference between two date columns. The answer is B) FALSE.
Step-by-step explanation:
The answer is B) FALSE. You do not need to use the TO_DATE function to calculate the difference between two date columns. The TO_DATE function is used to convert a string to a date format, but to calculate the difference between two date columns, you can simply subtract one date from another.
For example, if you have two columns, column A with the start date and column B with the end date, you can calculate the difference by subtracting B from A: B - A.
It is important to note that the result of this subtraction will be in the format of the date difference, such as number of days, months, or years.