Solved

How to create running sum in microsoft access

Posted on 2010-11-09
15
411 Views
Last Modified: 2013-11-27
How to create running sum in microsoft access
0
Comment
Question by:peatmilet
  • 7
  • 6
  • 2
15 Comments
 
LVL 92

Expert Comment

by:Patrick Matthews
ID: 34097590
In a query?  On a report?  In a form?
0
 
LVL 75
ID: 34097594
In a Report?  If so, in a text box control, set the Running Sum property to Over Group or Over All

mx

0
 

Author Comment

by:peatmilet
ID: 34097743
Sorry for lack of precision; in a querry.
0
Use Case: Protecting a Hybrid Cloud Infrastructure

Microsoft Azure is rapidly becoming the norm in dynamic IT environments. This document describes the challenges that organizations face when protecting data in a hybrid cloud IT environment and presents a use case to demonstrate how Acronis Backup protects all data.

 
LVL 75
ID: 34097785
Well, this KB:

http://support.microsoft.com/?kbid=210338

describes how to do this on a Form.  You might be able to adapt this to a query, calling the function from a query expression instead.

matthewspatrick might have a clever solution using SQL as well ...?

mx
0
 
LVL 92

Accepted Solution

by:
Patrick Matthews earned 500 total points
ID: 34097817
Ask, and ye shall receive.This is a generic example, as the Asker has not provided any hints about his/her data.  It assumes that there is an ID column we can use for the ordering.
SELECT t1.Name, t1.Qty,
    (SELECT Sum(t2.Qty)
    FROM SomeTable t2
    WHERE t2.Name = t1.Name And t2.ID <= t1.ID) AS RunningTotal
FROM SomeTable t1
ORDER BY t1.Name, t1.ID

Open in new window

0
 

Author Closing Comment

by:peatmilet
ID: 34098052
Thank you very much for quick turn arround!
0
 
LVL 75
ID: 34098139
FYI ... I just ran that exact query on a table with 189K records, using a Name field (Windows User Name), sequential ID field (AutoNumber) and a two digit Qty field.

After approx 5 minutes @ 75-80% CPU resources being used, I finally had to hit Control+Break to stop the query, which never completed.

mx
0
 
LVL 92

Expert Comment

by:Patrick Matthews
ID: 34099291
MX,Out of curiosity, how does this one do on that benchmark?Patrick
SELECT t1.Name, t1.Qty, Sum(t2.Qty) AS RunningTotal
FROM SomeTable t1 INNER JOIN
    SomeTable t2 ON t1.Name = t2.Name And t2.ID <= t1.ID
GROUP BY t1.Name, t1.Qty
ORDER BY t1.Name, t1.ID

Open in new window

0
 
LVL 75
ID: 34099307
Ahh ... not quite following ?
0
 
LVL 92

Expert Comment

by:Patrick Matthews
ID: 34101796
What I meant was, is the performance any better when instead of using a subquery, we use a self-join with GROUP BY.BTW, the SQL statement above had an error; it should have been:
SELECT t1.ID, t1.Name, t1.Qty, Sum(t2.Qty) AS RunningTotal
FROM SomeTable t1 INNER JOIN
    SomeTable t2 ON t1.Name = t2.Name And t2.ID <= t1.ID
GROUP BY t1.ID, t1.Name, t1.Qty
ORDER BY t1.Name, t1.ID

Open in new window

0
 
LVL 92

Expert Comment

by:Patrick Matthews
ID: 34102176
Joe,I just ran the code above against a table of dummy data with 300,000 rows.  It took not quite 2 minutes to complete.Did you index the Name field?  Without an index there, Jet/Ace is going to have one hell of a time with it...Patrick
0
 
LVL 75
ID: 34103904
"I just ran the code above"
But did you run the original code - the subquery approach ?

I'm sure a self join is going to be faster than a subquery.

Yes, the Name field was indexed.

mx
0
 
LVL 92

Expert Comment

by:Patrick Matthews
ID: 34104200
No, I did not run the subquery code, as I figured the self-join might be faster :)
0
 
LVL 75
ID: 34104231
If you have time, try just to confirm my results ... good info to know.

I will try your test also.

mx
0
 
LVL 92

Expert Comment

by:Patrick Matthews
ID: 34104826
Interesting.  The subquery one ran in just a few seconds for me, while the self-join version runs at ~2 minutes...
0

Featured Post

Backup Your Microsoft Windows Server®

Backup all your Microsoft Windows Server – on-premises, in remote locations, in private and hybrid clouds. Your entire Windows Server will be backed up in one easy step with patented, block-level disk imaging. We achieve RTOs (recovery time objectives) as low as 15 seconds.

Question has a verified solution.

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

Suggested Solutions

As tax season makes its return, so does the increase in cyber crime and tax refund phishing that comes with it
Preparing an email is something we should all take special care with – especially when the email is for somebody you may not know very well. The pressures of everyday working life stacked with a hectic office environment can make this a real challen…
Familiarize people with the process of utilizing SQL Server functions from within Microsoft Access. Microsoft Access is a very powerful client/server development tool. One of the SQL Server objects that you can interact with from within Microsoft Ac…
In Microsoft Access, learn how to “cascade” or have the displayed data of one combo control depend upon what’s entered in another. Base the dependent combo on a query for its row source: Add a reference to the first combo on the form as criteria i…

813 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

13 Experts available now in Live!

Get 1:1 Help Now