Crystal Reports Need to Group by Derived Date Range

Question

Long time listner, first time caller. I\'m using Crystal Reports 2010.

I have daily trade information that I need to group together if the volume doesn\'t change. H

Answer 1

I'd use the "X-2" suppression function to hide all but the last from each row, and Previous() and Next() to find the endpoints.

Group by BegDate; suppressing the details and group footer sections.

Create an {@UpdateCurrentBegDate} function somewhere in the group header

WhilePrintingRecords;    
Global DateVar CurrentBegDate;

If PreviousIsNull({table.Volume}) or Previous({table.Volume}) <> {table.Volume}
    Then ( //We found a new range
        CurrentBegDate = {table.BegDate};
     );

""; //Display nothing on screen

And a {@DisplayBegDate} function where you currently have BegDate being shown

EvaluateAfter({@UpdateCurrentBegDate});
Global DateVar CurrentBegDate;

Go to the Section Expert and click "X-2" next to the Suppress option (for the group header section). This is the formula for there

Not(NextIsNull({table.Volume}) or Next({table.Volume}) <> {table.Volume})

If you need to do totals or other calculations, you would do it in the {@UpdateCurrentBegDate} function (and you'd want to change the name to {@UpdateCurrentValues} or something similar). You can also create a new function that checks the Next() information if you only want to change things when the group changes -- using the default totalling functions will include the hidden values.