- 专利标题： Stratified sampling of data in a database system
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申请号： US10113497申请日： 2002-04-01
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公开(公告)号： US07069264B2公开(公告)日： 2006-06-27
- 发明人: Vijayakumar Anjur , Ambuj Shatdal
- 申请人： Vijayakumar Anjur , Ambuj Shatdal
- 申请人地址： US OH Dayton
- 专利权人： NCR Corp.
- 当前专利权人： NCR Corp.
- 当前专利权人地址： US OH Dayton
- 代理机构： Trop, Pruner & Hu
- 主分类号： G06F17/30
- IPC分类号： G06F17/30
摘要：
A stratified sampling mechanism is provided in a database system. The stratified sampling mechanism includes defining a clause in a query that indicates stratified sampling is desired. Data from a source table is stratified into different subgroups based on stratification conditions in the query. Sampling is performed within each subgroup.
公开/授权文献
- US20020198863A1 Stratified sampling of data in a database system 公开/授权日：2002-12-26
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