Can I do multi-database or cross-database queries with Firebird?
Short answer: You can't.
The only way is to pump the data from one to another using tools like IBDataPump, FBCopy, FBExport, or some of administration tools that have this option. See FAQ #20 for details.
You can, however, do the multi-database transactions: have a one transaction that reads and changes data in multiple database. Firebird's ACID compliant and ensures that this is possible.
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