When you need to compare dates and calculate the difference in months between two dates, you use the MONTHS_BETWEEN function in Oracle SQL.
A. This statement is incorrect because MONTHS_BETWEEN takes the later date first, then the earlier date.
B. This statement is correct. The MONTHS_BETWEEN function returns the number of months between two dates. It takes the later date (in this case, SYSDATE) first and the earlier date (start_date) second. If the start_date is within the last 25 months, the result will be less than or equal to 25.
C. This statement is incorrect. The expression TO_NUMBER(start_date - SYSDATE) would not give the correct number of months between the dates.
D. This statement is incorrect. The ADD_MONTHS(start_date, 25) function adds 25 months to start_date, and comparing it to SYSDATE would show dates that are at least 25 months in the future.
[Reference:, Oracle Documentation on Date Functions: https://docs.oracle.com/database/121/SQLRF/functions089.htm#SQLRF00651, , ]
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