I assumed from your description you wanted to show a date for anything where SD <> "Other" (That is what you put in your formula lol)
Try the following instead;
if {table.date} >= {?startdate}
and {table.date} <= {?enddate}
and isnull({table.sd})
then {table.date}
else date(1901,01,01)
Regards,
Ryan.
EDIT: I think I misunderstood your original post, you're saying if there are no records at all on a date - you want to know that date? I originally thought you wanted to return the dates of records where a fields had no data.
If that is what you want I don't think it's possible using Crystal directly, you'd need to write a SQL command.
Regards,
Ryan.
Edited by rkrowland - 01 Feb 2012 at 3:13am