7-4. Adding Years to a Date
Problem
You are developing an application that requires date calculations to be performed. You need to determine how to add to a specified date. You may also want to subtract years.
Solution
Create a function that will calculate a new date based upon the number of years that you have specified. If you want to subtract a number of years from a date, then pass a negative value for the number of years. The following code implements this functionality:
CREATE OR REPLACE FUNCTION calculate_date_years (in_date DATE,
in_years NUMBER)
RETURN DATE AS
new_date DATE;
BEGIN
IF in_date is NULL OR in_years is NULL THEN
RAISE NO_DATA_FOUND;
END IF; new_date := ADD_MONTHS(in_date, ...Get Oracle and PL/SQL Recipes: A Problem-Solution Approach now with the O’Reilly learning platform.
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