?
Solved

MS Access 2003 - sum is producing too many decimal places

Posted on 2011-03-14
6
Medium Priority
?
825 Views
Last Modified: 2012-05-11
SELECT tblDrafts.D_CaseNumber, Sum(tblDrafts.D_Amount) AS SumOfD_Amount
FROM tblDrafts
GROUP BY tblDrafts.D_CaseNumber;

produces sum with many decimal digits instead of two digits as defined in the table. By using Round function, it is not giving correct sum in decimal values. Example, the value in table is say 169531.10 and it is showing 169531.09 because it is rounding 169531.09354...
0
Comment
Question by:gpdixit
[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
6 Comments
 
LVL 120

Expert Comment

by:Rey Obrero (Capricorn1)
ID: 35128633
try this

SELECT tblDrafts.D_CaseNumber, formatnumber(Sum(tblDrafts.D_Amount),2) AS SumOfD_Amount
FROM tblDrafts
GROUP BY tblDrafts.D_CaseNumber;
0
 
LVL 93

Accepted Solution

by:
Patrick Matthews earned 2000 total points
ID: 35128832
gpdixit,

Unless you are using the Decimal data type for that column with a Scale parameter of two, then you are NOT actually storing your values as numbers with two decimal places--rather, they are merely formatted that way for display.  As such, cap1's suggestion will not necessarily return the correct answer.

Instead, you would have to round each value BEFORE it goes into the sum:

SELECT D_CaseNumber, Sum(Round([D_Amount], 2)) AS SumOfD_Amount
FROM tblDrafts
GROUP BY D_CaseNumber;

Open in new window


That, of course, uses "banker's rounding".  To round Excel-style:

SELECT D_CaseNumber, Sum(Val(Format([D_Amount], "0.00"))) AS SumOfD_Amount
FROM tblDrafts
GROUP BY D_CaseNumber;

Open in new window


Be warned, though, that taking the sum of rounded items is a mathematically dubious idea :)

Patrick
0
 
LVL 52

Expert Comment

by:Gustav Brock
ID: 35129558
Always - always - use data type Currency for currency, amounts, etc.

If you can 't change the fields of the table, convert to Currency at the earliest stage:
SELECT 
  tblDrafts.D_CaseNumber, 
  Sum(CCur(tblDrafts.D_Amount)) AS SumOfD_Amount
FROM 
  tblDrafts
GROUP BY 
  tblDrafts.D_CaseNumber;

Open in new window


The reason for your rounding errors is caused by adding positive and negative amounts when these are Single or Double.

/gustav
0
Get free NFR key for Veeam Availability Suite 9.5

Veeam is happy to provide a free NFR license (1 year, 2 sockets) to all certified IT Pros. The license allows for the non-production use of Veeam Availability Suite v9.5 in your home lab, without any feature limitations. It works for both VMware and Hyper-V environments

 
LVL 93

Expert Comment

by:Patrick Matthews
ID: 35129815
I was wondering when your "Spidey sense" would start tingling, gustav :)
0
 
LVL 52

Expert Comment

by:Gustav Brock
ID: 35129915
Believe me, it's operating at random!

/gustav
0
 

Author Closing Comment

by:gpdixit
ID: 35153893
Expert gave two solutions, out of which second solution was acceptable. I tried and and it is successful. Solution was provided in a very short time. Lot of thanks.
0

Featured Post

Hire Technology Freelancers with Gigs

Work with freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely, and get projects done right.

Question has a verified solution.

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

Access developers frequently have requirements to interact with Excel (import from or output to) in their applications.  You might be able to accomplish this with the TransferSpreadsheet and OutputTo methods, but in this series of articles I will di…
This article shows how to get a list of available printers for display in a drop-down list, and then to use the selected printer to print an Access report or a Word document filled with Access data, using different syntax as needed for working with …
Basics of query design. Shows you how to construct a simple query by adding tables, perform joins, defining output columns, perform sorting, and apply criteria.
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …

649 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