How to export data from database and import into another?

If your databases are on-line, i.e. visible to each other via network, then you can use some data pump tool like freeware IB Pump or some of advanced commercial administration tools which have this option integrated. On Linux, you can use open source FBCopy tool:

http://www.firebirdfaq.org/fbcopy.php

If your databases are offline, you should first export the data and then import it on the other end. Most admin. tools can do export to CVS,XML or INSERT statements. If efficiency is important, or your have data with BLOB column, you can use the open source FBExport tool (available on Linux and Windows).

http://www.firebirdfaq.org/fbexport.php

If you are looking for a way to easily import CSV or XML data into Firebird, take a look at XMLWizard tool. You can also use it to import data from Microsoft Excel or OpenOffice by saving the sheet to .csv format and then importing via XMLWizard:

http://www.guacosoft.com/xmlwizard