Using materialized view to process a related query containing a one to many lossless join
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United States of America Patent
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Sep 10, 2002
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N/A
app pub date -
Dec 28, 1998
filing date -
Dec 28, 1998
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Abstract
A method and apparatus for transforming queries is described. According to an aspect of the present invention, a select-project-join query Q that specifies at least one semijoin is rewritten into another query that references the materialized view M. A common section shared by the select-project-join query and the materialized view includes the tables being semijoined.
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