Virtual columns
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United States of America Patent
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Dec 13, 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 performing column functions on virtual columns in database tables. A virtual column is defined by the database to contain results of a defining expression. Statistics are collected and maintained for virtual columns. Indexing is performed on virtual columns. Referential integrity is maintained between two tables using virtual columns as keys. Join predicate push-down operations are also performed using virtual columns.
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