Finding the maximum value in a column using GQL

How do I find the maximum value in a particular column of a table 开发者_如何学Goin the GAE datastore using GQL?

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To get the max you using GQL, you could do this:

max_x = db.GqlQuery("SELECT * FROM MyModel ORDER BY x DESC").get().x

You could use this syntactically shorter but equivalent approach:

max_x = MyModel.all().order('-x').get().x