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.

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.

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.