Solved

How do I create date ranges based on a group of transactions?

Posted on 2008-06-25
7
236 Views
Last Modified: 2010-04-21
I have the following table:

PO          EFF_Date
1            01/01/2008
1            02/01/2008
1            03/01/2008
2            04/01/2008
2            05/01/2008

I want to build a table that looks like the following. The beg date will be the EFF_Date and the end date will be the day before the next EFF_Date. The last record of the PO will be "01/01/2010".

PO          Beg_Date             End_Date
1            01/01/2008           01/31/2008
1            02/01/2008           02/28/2008
1            03/01/2008           01/01/2010
2            04/01/2008           04/30/2008
2            05/01/2008           01/01/2010


I know there is a way of joining a table to itself to do this I just do not know how to do it.
0
Comment
Question by:Bob_Sheppard
  • 3
  • 2
  • 2
7 Comments
 
LVL 24

Expert Comment

by:mankowitz
ID: 21869499
It is very expensive to join a table to itself this way, you are much more efficient doing this in your application logic...... but here goes

select po, Eff_Date as Beg_date, (select top 1 Eff_Date from table where eff_date>Beg_date order by eff_date) as End_Date
0
 

Author Comment

by:Bob_Sheppard
ID: 21869512
What about the last record within the PO.
0
 
LVL 24

Accepted Solution

by:
mankowitz earned 250 total points
ID: 21869548
Oh, that won't work... maybe this:

select po, Eff_Date as Beg_date, coalesce((select top 1 Eff_Date - 1 from table where eff_date>Beg_date order by eff_date),'1/1/2010') as End_Date
0
What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

 
LVL 73

Expert Comment

by:sdstuber
ID: 21869665
SELECT po, eff_date beg_date,
       NVL(LEAD(eff_date) OVER(PARTITION BY po ORDER BY eff_date ASC) - 1,
           TO_DATE('01/01/2010', 'mm/dd/yyyy')
          ) end_date
  FROM yourtable
0
 
LVL 73

Expert Comment

by:sdstuber
ID: 21869791
oh, that's oracle syntax.

in version 2005, you should still be able to use the LEAD analytic function.

try this...


SELECT po, eff_date beg_date,
       coalesce(LEAD(eff_date) OVER(PARTITION BY po ORDER BY eff_date ASC) - 1,01/01/2010 ) end_date
  FROM yourtable
0
 
LVL 73

Expert Comment

by:sdstuber
ID: 21869802
oh nevermind,  sorry,  I'm thinking of different analytics (like row_number)
0
 

Author Closing Comment

by:Bob_Sheppard
ID: 31470737
I just needed to add a match to the PO in addition to the EFF Date for this to be correct. The concept was right on though.

Thanks
0

Featured Post

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Parse field in SQL View 15 98
need help in sql 4 67
How can i get data when i use where clause with group by? 3 22
Getting max record but maybe not use Group BY 2 17
Ever needed a SQL 2008 Database replicated/mirrored/log shipped on another server but you can't take the downtime inflicted by initial snapshot or disconnect while T-logs are restored or mirror applied? You can use SQL Server Initialize from Backup…
For both online and offline retail, the cross-channel business is the most recent pattern in the B2C trade space.
Using examples as well as descriptions, and references to Books Online, show the different Recovery Models available in SQL Server and explain, as well as show how full, differential and transaction log backups are performed
Via a live example, show how to setup several different housekeeping processes for a SQL Server.

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now