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Surprise Me!
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By mattiasjne
via appengineguy.com
Published: Jul 16 2008 / 12:52

How to do AVG and SUM in Google App Engine Data Store
People who are used to relational databases, which is pretty much every gosh-darned web developer out there, will run into pretty much the same obstacles with the app engine datastore - one of them is How the heck do I do SUM or AVG?. This a guide how to do it.
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