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The ORDERS table has a column ORDER_DATE of date type DATE The default display format for a date is DD-MON-RR Which two WHERE conditions demonstrate the correct usage of conversion functions?
Correct Answer: C
In SQL, the correct usage of conversion functions is crucial when performing operations on dates. Oracle uses the TO_DATE function to convert a string to a date, and the TO_CHAR function to convert dates or numbers to strings. Statement C is correct: WHERE order_date > TO_DATE('JUL 10 2018','MON DD YYYY'); is a proper use of the TO_DATE function. It converts the string 'JUL 10 2018' to a date type, with the format 'MON DD YYYY', which is then used to compare with the order_date. Statements A, B, D, and E are incorrect or misuse conversion functions: A is incorrect because TO_CHAR is used to convert dates or numbers to strings, not the other way around, and therefore should not be compared with order_date. B is incorrect because order_date is of type DATE, and you should not compare a DATE with a string without converting it; the TO_CHAR here should be TO_DATE. D is incorrect because it mixes TO_DATE and TO_CHAR in the same IN list, which should contain date types only. E is incorrect because TO_DATE should take a string as an argument, not a date returned by ADD_MONTHS.