Self join elimination through union
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United States of America Patent
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Oct 21, 2008
Grant Date -
Nov 23, 2006
app pub date -
Jul 28, 2006
filing date -
Jun 21, 2001
priority date (Note) -
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Abstract
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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