Method, system, and program for optimizing the processing of queries involving set operators
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United States of America Patent
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Sep 14, 2004
Grant Date -
Mar 20, 2003
app pub date -
Jun 29, 2001
filing date -
Jun 29, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
Provided is a method, system, and program for processing a query including a query operation on a table derived from a set operation on two result tables. The query operation is performed on each result table separately to produce two intermediate result tables. The set operator is then applied to the two intermediate result tables to produce a final result table that is a same result table that would have been produced by performing the query operation on the table derived from the set operation performed on the two result tables.
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