aggregation question

Hello,
I'm studying the Django page on aggregation
http://docs.djangoproject.com/en/dev/topics/db/aggregation/
In the section 'Joins and aggregates' there's an example of how to
create an annotation for each Store with book price ranges. But what
if I want to do the opposite, i.e. for each available Book, look up
through the stores and create a price range from this. This backward-
looking procedure is what's I'm most interested in.
Best regards,
Przemek

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