Count records based on detail row containing a null date field

Question

i need to count the no of rows where a date field is null and print the result in each group footer. the formula isnull works well in details section  but not when I create a running total to count records where evaluate condition is based on a formula and when i test isnull(field) ?
works in detail section:
Global NumberVar numOpen;
if (IsNull({db.DateField}))
then numOpen := numOpen + 1;
does not work in group footer?
IsNull({db.DateField})

Answer 1

Abhilash Kumar wrote:
Well, what database are you reporting off and how did you insert a NULL value to the date column?
In my case, I have worked with Oracle, Access, and now SQL.,
and have used several different versions of Crysal (but never XI)
I/we don't put anything into the date...  the field is simply empty and I use 
IsNull({datefield})
also for numbers (&currency)
IsNull({numberfield})
For text fields I now use
IsNull({textfield}) or {textfield} not equal ""
as SQL is a little funny about the empty text fields. Sometimes one works and sometimes the other so I use both.
Debi