Global optimization of correlated subqueries and exists predicates
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United States of America Patent
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Jun 2, 1998
Grant Date -
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app pub date -
Dec 21, 1995
filing date -
Dec 21, 1995
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Abstract
A method of optimizing a query and its subqueries together in a global manner regardless of the nesting levels. All joins in different nesting levels are effectively converted into joins in the same level by assigning a nesting level attribute to relations, assigning properties to the predicate, and assigning nesting level attributes and minimum relation set attributes to join predicate operands. The joins and their predicates are then considered as if they were contained in only the main query according to a set of rules based on the attributes of the relations and the join predicates.
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Patent Owner(s)
- TERADATA US, INC.
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Hoang, Chi Kim | Inglewood, CA | 10 | 440 |
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