Display data in jan-2009 to feb-2009 (N) , mar-2009 to may-2009 (Y)

Question

i have data in columns as
month status
01-jan-2009 N
01-feb-2009 N
01-mar-2009 Y
01-may-2009 Y
01-jun-2009 N
01-jul-2009 N
01-aug-2009 N
i want to display data as
jan-2009 to feb-2009 (N)
mar-2009 to may-2009 (Y)
jun-2009 to aug-2009 (N)

Answer 1

Hi,
Welcome to the forum.
Please always give your database version, it'll help us giving you a relevant solution.
Assuming you can use analytic functions, here's a solution using a "tabibitosan" method :
with sample_data as (
  select '01-jan-2009' mon,  'N' status from dual union all
  select '01-feb-2009', 'N' from dual union all
  select '01-mar-2009', 'Y' from dual union all
  select '01-may-2009', 'Y' from dual union all
  select '01-jun-2009', 'N' from dual union all
  select '01-jul-2009', 'N' from dual union all
  select '01-aug-2009', 'N' from dual
-- end of sample data
select min(mon) start_dt
,      max(mon) end_dt
,      status
from (
  select to_date(mon,'dd-mon-yyyy') mon
  ,      status
  ,      row_number() over(order by to_date(mon,'dd-mon-yyyy'))
         - row_number() over(partition by status order by to_date(mon,'dd-mon-yyyy')) as d
  from sample_data
group by status, d
order by start_dt
START_DT    END_DT      STATUS
01/01/2009  01/02/2009  N
01/03/2009  01/05/2009  Y
01/06/2009  01/08/2009  NI also assumed the date is stored in a VARCHAR2 column. If that's not the case, just remove TO_DATE function.
More on those techniques here :
Re: Tabibitosan method tutorial by Aketi Jyuuzou