On Aug 5, 3:11 pm, Michael Bayer <mike...@zzzcomputing.com> wrote:
>
> Ultimately you're looking for a self-referential correlation here.   In SQL, 
> that always implies using aliases.   Your column_property needs to be against 
> aliased(PC) and not PC itself.    

Thanks - that did the trick. I can't believe it was such a simple
thing.

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