Note: Use the count method to find out how many records are in a QuerySet.

注意：使用count方法可以确定一个QuerySet中有多少记录。

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The filter and exclude methods return QuerySet objects that can be chained together and can even perform joins. The q4 query below will find jobs posted since January 1st, 2006, in Cleveland, Ohio

filter 和 exclude 方法返回一些 QuerySet 对象，这些对象可以链接在一起，甚至可以执行连接操作。

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