The mutual exclusion relationships among data items are reflected by negative association rules, which is very important on the decision-making analysis. In the last several years, negative association rules are frequently researched, while the study object of it is single mining of database now. With the development of database technology, multi-database mining is more and more important. On the basis of analyzing the related technology, research status and shortage of present negative association rules mining, the selecting rules, weighted synthesis and algorithm are discussed on multi-datobase.
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