A theorem is given about whether or not an attribute is necessary for a certain attribute sets, and the corresponding algorithm is given based on SQL. Based on these research results, an improved attribute reduction algorithm based on rough set is presented.
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刘井莲. 一种基于SQL的属性约简算法[J]. 科学技术与工程, 2010, (25): . liujinglian. Attribute Reduction Algorithm Based on SQL[J]. Science Technology and Engineering,2010,(25).