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DB2 Query - Display results from next row along with current row

Posted on 2011-03-22
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Last Modified: 2012-06-21
Hi,

I have a table which looks like this:

POI      SEQUENCE       START DATE
APO1     2011-01        2011-01-01
APO1     2011-02        2011-01-15
APO1     2011-03        2011-02-01
APO1     2011-04        2011-02-15
APO1     2011-05        2011-03-01
APO1     2011-06        2011-03-15

I need to derive another table from this table which looks something like this:

POI      SEQUENCE       START DATE     (NEXT_START_DATE - 1 DAY)
APO1     2011-01        2011-01-01     2011-01-14
APO1     2011-02        2011-01-15     2011-01-31
APO1     2011-03        2011-02-01     2011-02-14
APO1     2011-04        2011-02-15     2011-02-28
APO1     2011-05        2011-03-01     2011-03-14
APO1     2011-06        2011-03-15     -

Any pointers on how I can achieve this? I tried various combinations using OUTER JOIN and EXCEPTION JOIN. I am staring at a wall at this moment!!

Regards
Ali.
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Question by:bhagatali
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2 Comments
 
LVL 37

Accepted Solution

by:
momi_sabag earned 125 total points
ID: 35193296
with a as (
  select poi, sequence, start_date, row_number() over(partition by poi order by start_date asc rown
 from your_table)

select t1.poi, t1.sequence, t1.start_date,  t2.start_date - 1 day
from a t1 left outer join a t2
    on t1.poi = t2.poi and t1.rown = t2.rown-1
0
 

Author Closing Comment

by:bhagatali
ID: 35330037
Thanks for the help.
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