Note that the tag's cascade attribute is set to none. That's because we don't want to delete products from the catalog when we delete an order.

这里的标签中的cadcade属性设置为none，这是因为我们在删掉一个订单信息时，不想连订单里的产品信息一并删掉。

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Simplification of Decision tables in Roouh set is order to lead decision rule or categorised rule at the least on the basis of the least condition attribute and minimum redundant attribute value.

粗糙集中决策表约简也就是以基于最少的条件属性和最小冗余的属性值导出最少的决策规则或分类规则。

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Besides, this thesis makes a simple discussion on using the theory of Rough Set to reduce attribute, in order to simplify the complexity of the algorithm.

另外，论文还就数据挖掘过程中应用粗糙集进行属性约简以简化算法复杂度做了一定的探讨。

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