No joins are not possible, ReferenceProperty's sort of forfill very basic joins. But nowhere near as powerful as a traditional RDMS
How to structure your data in the datastore is highly dependant on your data. There is no 'magic' formular to convert to the the datastore mentality. But one thing to remember, you dont tend to denormalise. You duplicate data to make for really quick queries. Also aim to do calculations at write time, rather than at query time. (Write once, read MANY) http://code.google.com/appengine/docs/python/datastore/typesandpropertyclasses.html#ReferenceProperty On 12/06/2009, Rajesh S <[email protected]> wrote: > > is it possible to use join query in google appp engine Application .If > not what might be the alternate way to resolve this problem... > > thanks in advance. > > > Rajesh S > > > > -- Barry - www.nearby.org.uk - www.geograph.org.uk - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
