Solved

Get the value from previous row and use it current row field in Access Query

Posted on 2014-11-07
4
1,350 Views
Last Modified: 2014-11-13
Hi I have query in access  where I have a table that has fields Item, Date Req, Required, Available that is grouped by Item, ordered by  Date Req field.
I like to get a field "Previous use" which will be the previous record value from the required field, except when it doesn't have one for the group, item. For example I like to see the result as follows

Item  Date Req     Required   Available   Previous Use    
Abc   11/1/14         100             600             0          
Abc    11/3/14         200            600             100    
Abc    11/10/14        100           600             300         ( 100 +200  which is  before 11/10/14)
CCC    11/2/14          200           700             0
CCC      11/5/14        300           700            200

I will appreciate if somebody can let me know how I can do this access query.
thanks
0
Comment
Question by:Sivasan
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 34

Accepted Solution

by:
Mike Eghtebas earned 500 total points
ID: 40429818
SELECT t.item, t.[Date Req], t.Required, t.Available, (Select nz(sum(tt.Required),0) From Table2 tt where t.Item = tt.Item And tt.[Date Req] <  t.[Date Req] ) + 0 AS [Previous Use]
FROM Table2 AS t
ORDER BY t.item, t.[Date Req];


+ 0 is optional. With it, the column displays like a number (right-justified).
0
 
LVL 34

Expert Comment

by:Mike Eghtebas
ID: 40429823
The following adds 'Balance' column:

SELECT t.item, t.[Date Req], t.Required, t.Available, (Select nz(sum(tt.Required),0) From Table2 tt where t.Item = tt.Item And tt.[Date Req] <  t.[Date Req] )+0 AS [Previous Use], [Available]-[Previous Use] AS Balance
FROM Table2 AS t
ORDER BY t.item, t.[Date Req];
0
 
LVL 38

Expert Comment

by:PatHartman
ID: 40432984
This is an expensive operation in a query.  It is trivial in a report or in a code loop.  What are you doing with the resultset?
0
 

Author Closing Comment

by:Sivasan
ID: 40440762
Hi eghtebas,
Thanks a lot for all your help.
PatHartman, thank you for your suggestion, yes, I do see it is an expensive operation. I use Crystal report for the report, so this was better doing it in access query. I ended up saving the query results on a table using make table, this was pulling the data on the report was not heavy.
thank you both
0

Featured Post

NEW Veeam Agent for Microsoft Windows

Backup and recover physical and cloud-based servers and workstations, as well as endpoint devices that belong to remote users. Avoid downtime and data loss quickly and easily for Windows-based physical or public cloud-based workloads!

Question has a verified solution.

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

AutoNumbers should increment automatically, without duplicates.  But sometimes something goes wrong, and the next AutoNumber value is a duplicate.  This article shows how to recover from this problem.
Code that checks the QuickBooks schema table for non-updateable fields and then disables those controls on a form so users don't try to update them.
Show developers how to use a criteria form to limit the data that appears on an Access report. It is a common requirement that users can specify the criteria for a report at runtime. The easiest way to accomplish this is using a criteria form that a…
In Microsoft Access, learn how to use Dlookup and other domain aggregate functions and one method of specifying a string value within a string. Specify the first argument, which is the expression to be returned: Specify the second argument, which …

630 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