Method and apparatus for querying relational databases
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United States of America Patent
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Issued Date -
Apr 6, 2006
app pub date -
Mar 28, 2003
filing date -
Mar 28, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention provides a method of evaluating a query involving one or more relational databases, each comprising a relational database management system (RDBMS), said query relating to at least two tables of said relational database, said method comprising determining a set of tables, including the tables referred to in the query, wherein each of the tables in said set is linked to at least one other table, such that, in a graphical representation of the database wherein the tables are represented as nodes and links between the tables are represented as lines between the nodes, they form a connected graph connecting nodes corresponding to the tables referred to in the query, performing a query on said set equivalent to the initial query, wherein said step of performing said query on said set comprises performing consecutive partial queries, wherein a result of a previous query is used as input for a later query, combining the results of said partial queries to obtain a result to the initial query. The invention further provides a related data processing system and program.
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