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First, sorry for the inconvenience, but we were not able to find documentation on this topic.
What's the format for the query in the DB dialog?
We want to obtain the total count of devices type I and devices type A. 
Hello! In panel you can set only where request parameter. To retrieve devices number you need to pass count parameter in request http://docs.appery.io/documentation/b... (Counting objects). There is no way to do that from backend panel. You would need to do REST request.