Need help with a query

Hi,

I have the following data:
>select min(start_air_date) start_date, max(end_air_date) end_date
, count(*) num_units
from br_bbdef_unit
where brdbuy_def_id = 352864
group by start_air_date, end_air_date
order by 1;

START_DAT END_DATE   NUM_UNITS
--------- --------- ----------
07-JAN-08 11-JAN-08          1
14-JAN-08 18-JAN-08          1
21-JAN-08 25-JAN-08          1
28-JAN-08 01-FEB-08          1
04-FEB-08 08-FEB-08          3
11-FEB-08 15-FEB-08          1
18-FEB-08 22-FEB-08          1
25-FEB-08 29-FEB-08          1
03-MAR-08 07-MAR-08          1
10-MAR-08 14-MAR-08          1

What I would like to do is to group consecutive dates with the same
number of units together to get their min/max values.  So in this case I
would end up with 3 records:
Start Date      End Date        Units/Wk
07-jan-08       01-feb-08       1
04-feb-08       08-feb-08       3
11-feb-08       14-mar-08       1

I'm thinking analytic functions may help here, but I haven't been able
to figure out a query to produce the desired output.

Any help would be greatly appreciated.

Thanks,

 -----------------------------------
Alan Davey
Senior Developer
Advertising Systems Group
Harris Corporation, Broadcast Communications
4 Century Drive
Parsippany, NJ  07054
--
http://www.freelists.org/webpage/oracle-l

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