How to use count in CE_CALC

Hi All

I have a requirement to find the count of  transactions which have country  assigned to them , I have anyalitcal view, I am using calculaion view on top of it.

I tried to  use CE_AGGR there I was able to count transactions but I could not apply the condition , I tried CE_CALC, but here I am not able to find  how to use count function and  also how to apply filters.Any ideas from the commnity would be helpful.

Thanks

Santosh