A requirement of this exercise is that you know in advance exactly what your risk is on each trade in your 20-tradesample 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。
2
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).