Date parameters for the previous fiscal quarter?

Question

Hello Folks,
I have this requirement of selecting the dates for the previous fiscal quarter. usually a fiscal quarter is January 2011 - March 2011. But in my case the fiscal year should be December 2010 to February 2011 and if i check in june 2011 it should return Mar 2011 till May 2011 and so forth. So how can i acheive to be able to select these dates i.e 12/1/2010 till 02/28/2011 in the where clause for the current date?
create table test_A (id int, col varchar(50),change_date date);
insert into test_A values(1, 'A',to_date('20101201 000000', 'YYYYMMDD HH24MISS'));
insert into test_A values(2, 'A1',to_date('20110122 000000', 'YYYYMMDD HH24MISS'));
insert into test_A values(3, 'A1',to_date('20110202 000000', 'YYYYMMDD HH24MISS'));
insert into test_A values(5, 'A1',to_date('20110306 000000', 'YYYYMMDD HH24MISS'));
insert into test_A values(6, 'A1',to_date('20110305 000000', 'YYYYMMDD HH24MISS'));
insert into test_A values(7, 'A1',to_date('20110307 000000', 'YYYYMMDD HH24MISS'));
select * from test_A
1     1     A     12/1/2010
2     2     A1     1/22/2011
3     3     A1     2/2/2011
4     5     A1     3/6/2011
5     6     A1     3/5/2011
6     7     A1     3/7/2011
I only want to see the following
1     1     A     12/1/2010
2     2     A1     1/22/2011
3     3     A1     2/2/2011

Answer 1

select  *
  from  test_A
  where change_date >= add_months(trunc(sysdate,'Q'),-1)
    and change_date <  add_months(trunc(sysdate,'Q'),2)
        ID COL                                                CHANGE_DATE
         1 A                                                  20101201 000000
         2 A1                                                 20110122 000000
         3 A1                                                 20110202 000000
3 rows selected.
SQL> SY.