数据仓库是什么？

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数据仓库是指从各种数据源通过ETL(抽取、转换、加载)得到规整的数据，往往是纬度表和事实表的方式；数据挖掘是指在数据仓库的既有数据上通过聚类，回归，神经网络等技术发现知识，得出结论支持决策。
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