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External functions (UDFs)

External functions must be "declared" (made known) to the database before they can be used. Firebird ships with two external function libraries:

• ib_udf – inherited from InterBase;
• fbudf – a new library using descriptors, present as from Firebird 1.0 (Windows) and 1.5 (Linux).

Users can also create their own UDF libraries or acquire them from third parties.

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