在示例代码中，我们再次计算加权平均数，但是感兴趣的读者很容易就能看出来，其实在聚集信息中完全可以加入复杂得多的结构。

In our sample code, we compute again the weighted average, but the interested reader can easily see that a much more complex structure could be to store the aggregation information.

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返回给DB2的中间结果中包含着常用的计数器(DB 2 max函数需要)，以及当前分组到目前为止计算出来的实际加权平均数。

The intermediate result that is returned to DB2 contains the usual counter (needed for the DB2 MAX function) and the actual weighted average that we have so far for the current group.

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因此，你每天晚上从新闻所了解到的道琼斯指数，都只不过是这些股票价值的一个加权平均数，正因为如此，道琼斯指数只能作为衡量它自身价值的一个数值来考虑。

So the Dow Jones number you hear in the news each night is simply this weighted average of stock prices. Because of this, the Dow Jones Industrial average should just be considered a price in itself.

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