CREATE OR REPLACE FUNCTION is_over_100(days_to_process NUMBER)
RETURN BOOLEAN IS
BEGIN
    RETURN  days_to_process > 100;
    /*
     if the above doesn't work,
     use this:
     */

    IF days_to_process > 100 THEN
        RETURN TRUE;
    ELSE
        RETURN FALSE;
    END IF;

END;
/