发明名称 |
Self join elimination through union |
摘要 |
A query optimization technique that determines whether a query includes a self join that is transitively derived through table expressions having UNION operators. If so, the query is simplified to eliminate the table expressions and to reduce the query to an equivalent query over tables.
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申请公布号 |
US7107255(B2) |
申请公布日期 |
2006.09.12 |
申请号 |
US20010887759 |
申请日期 |
2001.06.21 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
KIERNAN GERALD GEORGE;SHANMUGASUNDARAM JAYAVEL |
分类号 |
G06F17/30 |
主分类号 |
G06F17/30 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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