Summarise the results based on start and end dates

Hi All,
Can some body tells how to summarise a table results like in the below example?
I need help to get results as poc_dates_result from poc_dates table.
The data is supplied below to create the above tables.
Please provide the queries to convert poc_dates to poc_dates_result?
DROP TABLE poc_dates;
create table poc_dates
pid number
,start_dte date
,end_dte date
,prod char(3)
insert into poc_dates values(1,'01-JAN-2000','01-FEB-2000','PD1');
insert into poc_dates values(1,'02-FEB-2000','01-MAR-2000','PD1');
insert into poc_dates values(1,'02-MAR-2000','01-APR-2000','PD1');
insert into poc_dates values(1,'02-APR-2000','15-APR-2000','PD2');
insert into poc_dates values(1,'16-APR-2000','24-APR-2000','PD2');
insert into poc_dates values(1,'25-APR-2000','01-MAY-2000','PD3');
insert into poc_dates values(1,'02-MAY-2000','16-MAY-2000','PD3');
insert into poc_dates values(1,'17-MAY-2000','18-MAY-2000','PD1');
insert into poc_dates values(1,'19-MAY-2000','25-MAY-2000','PD1');
insert into poc_dates values(2,'01-JAN-2000','01-FEB-2000','PD1');
insert into poc_dates values(2,'02-FEB-2000','01-MAR-2000','PD1');
insert into poc_dates values(2,'02-MAR-2000','01-APR-2000','PD2');
insert into poc_dates values(2,'02-APR-2000','15-APR-2000','PD1');
insert into poc_dates values(2,'16-APR-2000','25-APR-2000','PD3');
insert into poc_dates values(3,'01-JAN-2000','01-FEB-2000','PD1');
insert into poc_dates values(3,'02-FEB-2000','01-MAR-2000','PD1');
insert into poc_dates values(3,'02-MAR-2000','01-APR-2000','PD2');
insert into poc_dates values(4,'01-JAN-2000','01-FEB-2000','PD1');
insert into poc_dates values(4,'02-FEB-2000','01-MAR-2000','PD2');
insert into poc_dates values(5,'01-JAN-2000','01-FEB-2000','PD1');
commit;
drop table poc_dates_result;
create table poc_dates_result
pid number
,start_dte date
,end_dte date
,prod char(3)
insert into poc_dates_result values(1,'01-JAN-2000','01-APR-2000','PD1');
insert into poc_dates_result values(1,'02-APR-2000','24-APR-2000','PD2');
insert into poc_dates_result values(1,'25-APR-2000','16-MAY-2000','PD3');
insert into poc_dates_result values(1,'17-MAY-2000','25-MAY-2000','PD1');
insert into poc_dates_result values(2,'01-JAN-2000','01-MAR-2000','PD1');
insert into poc_dates_result values(2,'02-MAR-2000','01-APR-2000','PD2');
insert into poc_dates_result values(2,'02-APR-2000','15-APR-2000','PD1');
insert into poc_dates_result values(2,'16-APR-2000','25-APR-2000','PD3');
insert into poc_dates_result values(3,'01-JAN-2000','01-MAR-2000','PD1');
insert into poc_dates_result values(3,'02-MAR-2000','01-APR-2000','PD2');
insert into poc_dates_result values(4,'01-JAN-2000','01-FEB-2000','PD1');
insert into poc_dates_result values(4,'02-FEB-2000','01-MAR-2000','PD2');
insert into poc_dates_result values(5,'01-JAN-2000','01-FEB-2000','PD1');
commit;
select * from poc_dates;
PID     START_DTE END_DTE     PROD
1     1/01/2000     1/02/2000     PD1
1     2/02/2000     1/03/2000     PD1
1     2/03/2000     1/04/2000     PD1
1     2/04/2000     15/04/2000     PD2
1     16/04/2000 24/04/2000     PD2
1     25/04/2000 1/05/2000     PD3
1     2/05/2000     16/05/2000     PD3
1     17/05/2000 18/05/2000     PD1
1     19/05/2000 25/05/2000     PD1
2     1/01/2000     1/02/2000     PD1
2     2/02/2000     1/03/2000     PD1
2     2/03/2000     1/04/2000     PD2
2     2/04/2000     15/04/2000     PD1
2     16/04/2000 25/04/2000     PD3
3     1/01/2000     1/02/2000     PD1
3     2/02/2000     1/03/2000     PD1
3     2/03/2000     1/04/2000     PD2
4     1/01/2000     1/02/2000     PD1
4     2/02/2000     1/03/2000     PD2
5     1/01/2000 1/02/2000     PD1
select * from poc_dates_result;
PID     START_DTE END_DTE PROD
1     1/01/2000     1/04/2000     PD1
1     2/04/2000     24/04/2000     PD2
1     25/04/2000 16/05/2000     PD3
1     17/05/2000 25/05/2000     PD1
2     1/01/2000     1/03/2000     PD1
2     2/03/2000     1/04/2000     PD2
2     2/04/2000     15/04/2000     PD1
2     16/04/2000 25/04/2000     PD3
3     1/01/2000     1/03/2000     PD1
3     2/03/2000     1/04/2000     PD2
4     1/01/2000     1/02/2000     PD1
4     2/02/2000     1/03/2000     PD2
5     1/01/2000     1/02/2000     PD1
Thanks,
CD
Edited by: cdprasad on Jul 15, 2010 10:52 AM

I'm sure there is simplest way to achieve this, but here below a try :
SQL> select pid,min(start_dte),max(end_dte),prod
2 from   (select pid,start_dte,end_dte,prod,sum(flg) over (order by pid,prod,start_dte) sm
3          from   (select pid,start_dte,end_dte,prod,
4                         decode(start_dte-1,lag(end_dte) over (partition by pid,prod order by start_dte),0,1) flg
5                  from   poc_dates))
6 group by pid,prod,sm
7* order by 1,4,2
SQL> /
       PID MIN(START_DTE) MAX(END_DTE)    PRO
         1 01-JAN-00       01-APR-00       PD1
         1 17-MAY-00       25-MAY-00       PD1
         1 02-APR-00       24-APR-00       PD2
         1 25-APR-00       16-MAY-00       PD3
         2 01-JAN-00       01-MAR-00       PD1
         2 02-APR-00       15-APR-00       PD1
         2 02-MAR-00       01-APR-00       PD2
         2 16-APR-00       25-APR-00       PD3
         3 01-JAN-00       01-MAR-00       PD1
         3 02-MAR-00       01-APR-00       PD2
         4 01-JAN-00       01-FEB-00       PD1
         4 02-FEB-00       01-MAR-00       PD2
         5 01-JAN-00       01-FEB-00       PD1
13 rows selected.Nicolas.

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/* Formatted on 5/20/2013 9:53:00 AM (QP5 v5.115.810.9015) */
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
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AGENT_SID    PATH                       START_DT    END_DT
A100    A100,M100,M101,M102,M103,M104    1/1/2010    12/31/9999
A100    A100,M100,M107,M102,M103,M104    1/1/2010    12/31/9999
A101    A101,M105,M106                   1/1/2010    12/31/9999
Results Required
A100    A100,M100,M101,M102,M103,M104    1/1/2010    5/18/2013
A100    A100,M100,M107,M102,M103,M104    5/20/2013   12/31/9999
A101    A101,M105,M106                   1/1/2010    12/31/9999

May be this..
SQL> select agent_sid,max(path) path,max(start_dt) start_dt,
2         min(end_dt) end_dt
3 from
4 (
5    select agent_sid,path,start_dt,end_dt,
6           sum(flg) over(order by rn) sm
7    from
8    (
9      select agent_sid,
10             path,
11             start_dt,
12             end_dt,rn,
13             case when path like lag(path) over(order by rn)||'%' then 0 else 1 end flg
14      from
15      (
16        SELECT   CONNECT_BY_ROOT (b.sid) agent_sid,
17                 TRIM (
18                    LEADING ',' FROM    SYS_CONNECT_BY_PATH (b.sid, ',')
19                                     || ','
20                                     || b.emp_mgrs_id
21                 )
22                  PATH,
23                 START_EFFECTIVE_DT Start_dt,
24                 END_EFFECTIVE_DT End_dt,rownum rn
25        FROM   PERSON_DTL b
26        START WITH   sid IN ('A101', 'A100')
27        CONNECT BY   PRIOR b.emp_mgrs_id = b.sid
28      )
29    )
30 )
31 group by agent_sid,sm
32 order by agent_sid;
AGENT_SID PATH                                     START_DT END_DT
A100       A100,M100,M101,M102,M103,M104            01-JAN-10 18-MAY-13
A100       A100,M100,M107,M102,M103,M104            20-MAY-13 31-DEC-99
A101       A101,M105,M106                           01-JAN-10 31-DEC-99Edited by: jeneesh on May 20, 2013 7:54 PM
Not thoroughly tested.And not sure whether an easy way exists..

Summarise the results based on start and end dates

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