发明名称 |
Method for estimating cardinalities for query processing in a relational database management system |
摘要 |
The present invention provides a method for estimating cardinalities for query processing in a relational database management system. The present method is suitable for use with a query optimizer for estimating cardinalities for sets of columns or keys resulting from a grouping operation or a duplicate removal operation.
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申请公布号 |
US5761653(A) |
申请公布日期 |
1998.06.02 |
申请号 |
US19960626887 |
申请日期 |
1996.04.03 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
SCHIEFER, BERNHARD;STRAIN, LORI G.;YAN, WEIPENG P. |
分类号 |
G06F17/30;(IPC1-7):G06F17/30 |
主分类号 |
G06F17/30 |
代理机构 |
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地址 |
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