发明授权
- 专利标题： Cost-based subquery correlation and decorrelation
- 专利标题（中）： 基于成本的子查询相关和去相关
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申请号： US11156500申请日： 2005-06-17
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公开(公告)号： US07376646B2公开(公告)日： 2008-05-20
- 发明人: Thomas Abel Beavin , Mengchu Cai , Yao-Ching Stephen Chen , Hsiuying Yen Cheng , Fen-Ling Lin , Irene Ching-Hua Liu , Jerry Mukai , Demai Ni , Yoichi Tsuji , Li Xia , Ying Zeng
- 申请人： Thomas Abel Beavin , Mengchu Cai , Yao-Ching Stephen Chen , Hsiuying Yen Cheng , Fen-Ling Lin , Irene Ching-Hua Liu , Jerry Mukai , Demai Ni , Yoichi Tsuji , Li Xia , Ying Zeng
- 申请人地址： US NY Armonk
- 专利权人： International Business Machines Corporation
- 当前专利权人： International Business Machines Corporation
- 当前专利权人地址： US NY Armonk
- 代理机构： Konrad Raynes & Victor LLP
- 代理商 Janaki K. Davda
- 主分类号： G06F17/30
- IPC分类号： G06F17/30
摘要：
Techniques are provided that determine that a query includes at least one subquery that may be correlated or decorrelated. An internal representation of the query that represents the subquery in both correlated and decorrelated form is generated, wherein the internal representation includes at least one virtual table.
公开/授权文献
- US20060287979A1 Cost-based subquery correlation and decorrelation 公开/授权日：2006-12-21
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