hi ravi
regarding your second point, are you considering the table as the foundation, with a calc column.
Or ...
using the AN view in the AT view, in this case there is no Foundation, and no way to add a calc column. Also, as my only object would be an AN view, there is no join either. so this way seems to be impossible.
regarding "...why do you need to use Orders ..."
it is just an example (probably a bad one)
ta