Ok. Say I have many (>1000) Model entities with two properties 'x' and 'date'. What is the most efficient query to fetch say the latest 200 entities where x > 50. I don't care what their 'date's are as long as I get the latest and x > 50
Thanks again for your help. On Jun 22, 4:11 pm, "Nick Johnson (Google)" <nick.john...@google.com> wrote: > Consider precalculating this data and storing it against another entity. > This will save a lot of work on requests. > > -Nick Johnson > > > > On Mon, Jun 22, 2009 at 3:55 PM, herbie <4whi...@o2.co.uk> wrote: > > > No the users won't need to read 1000 entities, but I want to calculate > > the average of a property from the latest 1000 entities. > > > On Jun 22, 3:30 pm, "Nick Johnson (Google)" <nick.john...@google.com> > > wrote: > > > Correct. Are you sure you need 1000 entities, though? Your users probably > > > won't read through all 1000. > > > > -Nick Johnson > > > > On Mon, Jun 22, 2009 at 3:23 PM, herbie <4whi...@o2.co.uk> wrote: > > > > > So to be sure to get the latest 1000 entities I should add a datetime > > > > property to my entitie model and filter and sort on that? > > > > > On Jun 22, 1:42 pm, herbie <4whi...@o2.co.uk> wrote: > > > > > I know that if there are more than 1000 entities that match a query, > > > > > then only 1000 will be return by fetch(). But my question is which > > > > > 1000? The last 1000 added to the datastore? The first 1000 added to > > > > > the datastore? Or is it undedined? > > > > > > Thanks > > > > > Ian > > > > -- > > > Nick Johnson, App Engine Developer Programs Engineer > > > Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration > > Number: > > > 368047 > > -- > Nick Johnson, App Engine Developer Programs Engineer > Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number: > 368047 --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
