Methods and apparatus for joining two or more tables are disclosed. A query including a join query is received, where the join query requests that a new table be generated from data obtained from two or more tables, where the two or more tables are stored at two or more data sources. One or more columns...http://www.google.de/patents/US7702616?utm_source=gb-gplus-sharePatent US7702616 - Methods and apparatus for processing a query joining tables stored at different data sources
