粗糙集理论由于其独特的知识表示方法在数据预处理方面有着得天独厚的优势，同时也成为数据库中知识发现的有效手段。
Rough Sets theory has great superiority in Data Preprocessing because of its particular expression of knowledge, as well as it makes an effective means of knowledge Discovery in Database.
理论上讲，可以在数据库分区组中尚未重分发的表上执行select、insert、update或delete语句。
In theory, you can perform select, insert, update, or delete statements against a table that is not yet redistributed in the database partition group.
理论上讲，可以在数据库分区组中尚未重分发的表上执行select、insert、update或delete语句。
In theory, you can perform select, insert, update, or delete statements against a table that is not yet redistributed in the database partition group.
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