Method and system for rewriting a database query
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United States of America Patent
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Feb 2, 2010
Grant Date -
Jun 26, 2008
app pub date -
Dec 18, 2006
filing date -
Dec 18, 2006
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Abstract
The invention relates to a method and database system for rewriting a SQL query having at least one null sensitive expression (NSE) in a select list of the query, the query comprising at least one outer join command to be performed on at least two tables and involving a view or a Derived Table (DT). The method comprising the steps of: identifying at least one unmatching row belonging to the view or DT using non-nullable fields that belong to the outermost table in the view or DT; converting the NSE(s) from the at least one identified rows into a SQL case construct; and performing the at least one outer join. The database system comprising means for rewriting a SQL query having at least one null sensitive expression (NSE) in a select list of the query, the query comprising at least one outer join command to be performed on at least two tables and involving a view or a Derived Table (DT). The system comprises a device configured to identify at least one unmatching row belonging to the view or DT using non-nullable fields that belong to the outermost table in the view or DT; a device configured to convert the NSE(s) from the at least one identified rows into a SQL case construct; and a device configured to perform the at least one outer join.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
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Patent Owner(s)
- TERADATA US, INC.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Ghazal, Ahmad | Redondo Beach, US | 9 | 42 |
Reichart, Donald | San Antonio, US | 1 | 3 |
Sathyanarayan, Pradeep | San Diego, US | 3 | 11 |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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