Include Null values

[yvonne-c]

I have the expression below which is working fine - but I also want to include all IDs where Field "MoveOff" is empty - is there a way to add these into my set analysis?

Count({<Dateon={"<31/10/2018"},MoveOff={">01/10/2018"}ID)

Thanks

[yvonne-c]

Thanks so much - this one is working!