How can we make the Partition on the result using only sql?

Hello

How to make the partition on sql result using the query.

sample
BPREF_NO     BILL_MONTt AVG_IND     partition
Q12345     1/31/2009     2     part1
Q12345     2/28/2009     2     part1
Q12345     3/31/2009     2     part1
Q12345     4/30/2009     2     part1
Q12345     5/31/2009     2     part1
Q12345     6/30/2009     1     part1
Q12345     7/31/2009     2     part1
Q12345     9/30/2009     1     part2
Q12345     10/31/2009     2     part2
Q12345     11/30/2009     2     part2
Q12345     1/31/2010     1     part3
Q12345     2/28/2010     2     part3
Q12345     3/31/2010     2     part3
Q12345     11/30/2011     2     part4
Q12345     2/29/2012     2     part5
Q12345     3/31/2012     2     part5
Q12345     4/30/2012     2     part5
Q12345     5/31/2012     2     part5
Q12345     7/31/2012     2     part6
I want to create the partition column using the query
from the logic below

If bill_month is the sequence then it must create a partition and if the breaks we need to introduce the new partition.

just for example...
January 31, 2009 to July 31, 2009 is called part1
August 30, 2009 to November 30, 2009 called part2
like wise...

is it possible to make the partition of the query itself.

Please guide me in this regard

Thanks in advance

Iqbal 
with testdata as (
select 'Q12345' BPREF_NO, to_date('1/31/2009','MM/DD/YYYY') BILL_MONTt,2 AVG_IND from dual union all
select 'Q12345', to_date('2/28/2009','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('3/31/2009','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('4/30/2009','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('5/31/2009','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('6/30/2009','MM/DD/YYYY'),1 from dual union all
select 'Q12345', to_date('7/31/2009','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('9/30/2009','MM/DD/YYYY'),1 from dual union all
select 'Q12345', to_date('10/31/2009','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('11/30/2009','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('1/31/2010','MM/DD/YYYY'),1 from dual union all
select 'Q12345', to_date('2/28/2010','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('3/31/2010','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('11/30/2011','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('2/29/2012','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('3/31/2012','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('4/30/2012','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('5/31/2012','MM/DD/YYYY'),2 from dual union all
select 'Q12345', to_date('7/31/2012','MM/DD/YYYY'),2 from dual
)

select
  BPREF_NO
, AVG_IND
, BILL_MONTt
, 'part'||
  sum (partition) over (partition by BPREF_NO order by BILL_MONTt)
  partition
from (
select
  BPREF_NO
, AVG_IND
, BILL_MONTt
, case
  when months_between (BILL_MONTt, lag(BILL_MONTt) over (partition by BPREF_NO order by BILL_MONTt)) = 1 then
  0 else 1 end partition
from testdata
)

BPREF_NO AVG_IND BILL_MONTT PARTITION
Q12345 2 01/31/2009 part1
Q12345 2 02/28/2009 part1
Q12345 2 03/31/2009 part1
Q12345 2 04/30/2009 part1
Q12345 2 05/31/2009 part1
Q12345 1 06/30/2009 part1
Q12345 2 07/31/2009 part1
Q12345 1 09/30/2009 part2
Q12345 2 10/31/2009 part2
Q12345 2 11/30/2009 part2
Q12345 1 01/31/2010 part3
Q12345 2 02/28/2010 part3
Q12345 2 03/31/2010 part3
Q12345 2 11/30/2011 part4
Q12345 2 02/29/2012 part5
Q12345 2 03/31/2012 part5
Q12345 2 04/30/2012 part5
Q12345 2 05/31/2012 part5
Q12345 2 07/31/2012 part6

Tags: Database

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