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How to get a summary of a calculation from a subreport to the main report in Crystal Reports 2008

Hi,
      I have a subreport placed in the group header of a main report in Crystal Reports 2008. The subreport has an average calculated for the records in it using a formula (Sum/Count). So, the main report shows an average for each group as the subreport is placed in the group header. Could anyone tell me how to get the total average on the main report for the field which is in the subreport ?


Thanks in advance.
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pradeepdevineni
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pradeepdevineni
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2 Solutions
 
Ido MilletProfessor of MIS at Penn State Erie and Owner, Millet SoftwareCommented:
Set the value of a Shared variable in a subreport formula.  A main report formula in a section BELOW the subreport section (in your case, a good choice would be in the Group Footer section) can then declare the same shared variable name and gain access to the value in it.
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pradeepdevineniAuthor Commented:
Thanks for your quick reply. I used the shared variables and got the average to display on the group footer of the main report. The result in the main report now shows an average for each group. This is the first part of my question which is solved.

Now, How can I get the "Total Average" (which means the average of all the records in all the groups) to display on the Report Footer of the main report ?

I tried to put the main report formula in the Report Footer of the main report. It didn't work. Do I have to change the location of the subreport ? I still need both the group averages and the Total average.
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Ido MilletProfessor of MIS at Penn State Erie and Owner, Millet SoftwareCommented:
Since you now have access to the data in the subreports, just decide what you want to do with that data.  You can use other variables to accumulate the Grand Total Value and Grand Count, so that in the Report Footer you can divide one by the other to get the desired Grand Average.
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pradeepdevineniAuthor Commented:
I used shared variables to get the group sum and group counts from the subreport to the main report and divided them to get the Group average.

I tried to create running totals for the group sum and group counts in order to create the Grand sum and Grand counts. It doesn't let me do the running totals. I could see the group sum and group counts formulas in the Formula Fields of Field Explorer. But for some reason, I dont see the group sum and group count formula fields in the "Create Running Total Field" window in order to summarize.

Do you know why they are not showing up ? And could you provide a solution to this ?
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Ido MilletProfessor of MIS at Penn State Erie and Owner, Millet SoftwareCommented:
You can't do a Running Total on "Print Time" formulas (shared variables make any formula a Print Time (2nd pass) formulas).  Instead, you have to use variables in formulas to accumulate the group values into Grand totals.
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mlmccCommented:
Change your group average formula

WhilePrintingRecords;
Global NumberVar GrandTotal;
Global NumberVar GrandCount;
Shared NumberVar GroupTotal;
SharedNumberVar GroupCount;
GrandTotal := GrandTotal + GroupTotal;
GrandCount := GrandCount + GroupCount;
GroupTotal / GroupCount

In the report header add a formula
WhilePrintingRecords;
Global NumberVar GrandTotal;
Global NumberVar GrandCount;
""

In the report footer calculate the overall average
WhilePrintingRecords;
Global NumberVar GrandTotal;
Global NumberVar GrandCount;
GrandTotal / GrandCount

mlmcc
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pradeepdevineniAuthor Commented:
Thank you. That really worked.
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