Exploitation of subsumption in optimizing scalar subqueries
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United States of America Patent
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Jan 15, 2002
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app pub date -
Aug 13, 1998
filing date -
Aug 13, 1998
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Abstract
An optimization technique for SQL queries. A query is analyzed to determine whether it includes one or more scalar subqueries and one or more existential subqueries. The scalar subqueries and the existential subqueries are transformed into join operations using subsumption, and the join operations are merged into a single join query block. The join query block can then be executed in the computer to efficiently retrieve data from the relational database.
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