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Query based on query
  Available only with these kinds of connection
Queries can be based on items from another query. The source query must have already been executed. This type of query is available: Caution: Do not confuse "Query based on query" and "Sub-query". For more details, see Sub-query. Limitation: Queries based on a query are not available for external databases (via OLE DB, ODBC or Native Connector). The database cannot determine the source query from which the second query is created.
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