发明授权
- 专利标题： Independent column detection in selectivity estimation
- 专利标题（中）： 选择性估计中的独立列检测
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申请号： US12350283申请日： 2009-01-08
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公开(公告)号： US08024286B2公开(公告)日： 2011-09-20
- 发明人: Grace Kwan-On Au , Rama Krishna Korlapati , Haiyan Chen
- 申请人： Grace Kwan-On Au , Rama Krishna Korlapati , Haiyan Chen
- 申请人地址： US OH Dayton
- 专利权人： Teradata US, Inc.
- 当前专利权人： Teradata US, Inc.
- 当前专利权人地址： US OH Dayton
- 代理机构： Schwegman, Lundberg & Woessner
- 主分类号： G06F17/30
- IPC分类号： G06F17/30
摘要：
Techniques for independent column detection in selectivity estimations are provided. Values for database statistics are sampled and two independent tests are performed against the values for a first column and a second column. When each test determines that the first and second columns are independent, the first and second columns are said to be independent columns for selectivity estimation.
公开/授权文献
- US20100174702A1 INDEPENDENT COLUMN DETECTION IN SELECTIVITY ESTIMATION 公开/授权日：2010-07-08
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