A requirement of this exercise is that you know in advance exactly what your risk is on each trade in your 20-trade sample size.

这个练习要求你在20笔的交易前能提前知道自己的风险是多少。

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In our sample table, values in the COMMENT column (a relational column) can be used to isolate the type of trade recorded in the DOCUMENT column (an XML column).

在我们的样例表中，comment列(一个关系列)中的值可以用于分隔记录在document列(一个xml列)中的交易类型。

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Sample query returning a fragment of persistent XML trade data.

返回一段永久XML交易数据的样例查询。

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