Hi, I'm trying to do a relatively simple query using appengine(1.3.3) and JDO. Basically I want to obtain the "top 10 ranked entities for the last year". Assume I have an entity FOO and properties startDate and rating ...I would normally do this using a query like below:
select from FOO where startDate >= someDate order by rating desc range 0,10; I understand however that inequality filters must be specified first in any sort ordering and so this does not work. So the only way I know to accomplish this is to query for all FOOs where startDate >= someDate and then sort them in-memory by rating. This could work, but I anticipate a large amount of data in FOO and so I don't want to load 10K records into memory to sort them when I really only the top 10 of them. Any other ideas on how to workaround this limitation? Thanks for your help... -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
