Way to populate data for current quater months from last month of previous quater

Question

Hi  I have a requirement to load forecast data into the SSAS cube.
My current data:
Snapshot_M       Date         F_Quantities
1/1/2014        1/1/2014    100
2/1/2014        2/1/2014    90
3/1/2014        3/1/2014    80
4/1/2014        4/1/2014    23
4/1/2014        5/1/2014    0
4/1/2014        6/1/2014    0
I want this two be shown as
Snapshot_M       Date        F_Quantities
1/1/2014        2/1/2014    100
1/1/2014        3/1/2014    100
1/1/2014        4/1/2014    100
4/1/2014        5/1/2014     23
4/1/2014        6/1/2014     23
4/1/2014        7/1/2014     23
Snapshot_M filed is the month when data was loaded.
So to summarize, the data that is loaded in last month of fiscal Q1  (January) should serve as data for fiscal Q2 (Feb, Mar, APR), the data loaded on last month of Fiscal Q2 will serve as forecast data for Q3 an so on. ...
Thanks  

Answer 1

CREATE TABLE SAMPLEDATA(Snapshot_M DATETIME, Date DATETIME, F_Quantities INT)
--fixed
INSERT INTO SAMPLEDATA VALUES ('09/1/2013','09/01/2013',14)
INSERT INTO SAMPLEDATA VALUES ('10/1/2013','10/01/2013',13)
INSERT INTO SAMPLEDATA VALUES ('11/1/2013','11/01/2013',12)
INSERT INTO SAMPLEDATA VALUES ('12/1/2013','12/01/2013',11)
INSERT INTO SAMPLEDATA VALUES ('01/1/2014','01/01/2014',10)
INSERT INTO SAMPLEDATA VALUES ('02/1/2014','02/01/2014',90)
INSERT INTO SAMPLEDATA VALUES ('03/1/2014','03/01/2014',20)
INSERT INTO SAMPLEDATA VALUES ('04/1/2014','04/01/2014',23)
INSERT INTO SAMPLEDATA VALUES ('05/1/2014','05/01/2014',30)
INSERT INTO SAMPLEDATA VALUES ('06/1/2014','06/01/2014',70)
INSERT INTO SAMPLEDATA VALUES ('07/1/2014','07/01/2014',20)
--Desired result set:
Snapshot_M newdate F_Quantities
2013-10-01 00:00:00.000 2013-11-01 00:00:00.000 13
2013-10-01 00:00:00.000 2013-12-01 00:00:00.000 13
2013-10-01 00:00:00.000 2014-01-01 00:00:00.000 13
2014-01-01 00:00:00.000 2014-02-01 00:00:00.000 10
2014-01-01 00:00:00.000 2014-03-01 00:00:00.000 10
2014-01-01 00:00:00.000 2014-04-01 00:00:00.000 10
2014-04-01 00:00:00.000 2014-05-01 00:00:00.000 23
2014-04-01 00:00:00.000 2014-06-01 00:00:00.000 23
2014-04-01 00:00:00.000 2014-07-01 00:00:00.000 23
;with mycte as (select *, lead(Date,1)Over(Order by date) newdate
, Cast(Year(Snapshot_M) as char(4))+Cast(datepart(q, Snapshot_M) as char(1)) q
, row_number() over(Partition by Cast(Year(Snapshot_M) as char(4))+Cast(datepart(q, Snapshot_M) as char(1)) order by date) rn
,count(*) over(Partition by Cast(Year(Snapshot_M) as char(4))+Cast(datepart(q, Snapshot_M) as char(1)) ) cnt
from SAMPLEDATA
,mycte1 as (
Select rn, q,
(case when rn=1 then Snapshot_M end) Snapshot_M, newDate
, (case when rn=1 then F_Quantities end) F_Quantities from mycte
WHERE cnt=3)
Select
max(Snapshot_M) Over(partition by q) Snapshot_M
,newdate
,max(F_Quantities) Over(partition by q) F_Quantities
from mycte1
Order by newDate
drop table SAMPLEDATA