Counting empty fields

[hall312]

I have a "to do list" in a portal. Works great. When the to do item is completed a date is inserted. The not yet completed items don't have this date. How do I get a count of the not yet completed items? Something along the lines of:

If (IsEmpty ( To Do::Date Completed ) ; Count ( To Do::To Do ID) )

This obviously doesn't work because once a completed date is entered into any of the items, it quits counting. I think I'm on the right track, just not there yet.

[comment]

Try:

Count ( To Do::To Do ID ) - Count ( To Do::Date Completed )

[hall312]

Perfect !! Thank you very much.