粗糙集(Rough Sets)是Infobright的核心技术之一。Infobright在执行查询的时候会根据知识网络(Knowledge Grid)把DP分成三类:
案例:
复制代码 代码如下:
SELECT COUNT(*) FROM employees WHERE salary > 100000 AND age < 35 AND job = ‘IT' AND city = ‘San Mateo';
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