Solved

How to compare a value in the current row with a value in the previous row?

Posted on 2006-11-30
3
419 Views
Last Modified: 2008-02-01
Experts-

In my report, I want to report on the numeric difference between two values in order to show the delta. For example:

Month 1:  35 widgets   Delta: Unknown
Month 2:  15 widgets   Delta: -20
Month 3:  17 widgets   Delta: +2
Month 4:  22 widgets   Delta: +5

Can I create a formula in Crystal that will do this? (I suppose I need to store the previous row's widget count as a variable, so I can then compare it with the current row's count.) I also need to handle--as the example shows--the first row that won't have a previous row for comparison.

Thanks.
0
Comment
Question by:DataDesignIT
[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
3 Comments
 
LVL 101

Accepted Solution

by:
mlmcc earned 500 total points
ID: 18047451
Try this

Name - MyDelta
Formula
If (PreviousIsNull({YourQuantityField})) then
  "Unknown"
Else
  ToText({YourQuantityField} - Previous({YourQuantityField}),0)

mlmcc
0
 

Author Comment

by:DataDesignIT
ID: 18048249
Perfect! Just what I needed. Thanks.
0
 
LVL 101

Expert Comment

by:mlmcc
ID: 18051094
Glad i could help

mlmcc
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

I hate sub reports and always consider them the last resort in any reporting solution.  The negative effect on performance and maintainability is just not worth the easy ride they give the report writer.  Nine times out of ten reporting requirements…
Hello everyone, Hope you find this as helpful as we did. We have on the company I work for an application built in Delphi V with Crystal Reports 8. We all know that Crystal & Delphi can be temperamental sometimes and the worst thing is, nearly…
Michael from AdRem Software outlines event notifications and Automatic Corrective Actions in network monitoring. Automatic Corrective Actions are scripts, which can automatically run upon discovery of a certain undesirable condition in your network.…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

729 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