Expression replacement in virtual columns
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United States of America Patent
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Oct 25, 2011
Grant Date -
Jun 11, 2009
app pub date -
Dec 6, 2007
filing date -
Dec 6, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
Techniques are described herein for replacing a part of an expression in a query to a database with a virtual column. A virtual column is defined by the database to contain results of a defining expression. A part of an expression in a query is replaced with a virtual column whose defining expression is equal to the part of the expression in the query. The part of an expression in a query can be the entire expression. When an expression in a query can be replaced with more than one replacement expression involving virtual columns, the replacement expression with the least cost of query processing is selected.
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