Here you can find Firebird documentation. It includes an official Firebird references and guides and articles from IBSurgeon.

Firebird Language Reference (for Firebird 2.5)

in English:  Download PDF or  Browse HTML

in Russian:  (release version): Download PDF

in German:  Download PDF (Beta version)


Firebird Hardware Guide

In English:  Download PDF or Browse HTML

In Russian:  Download PDF


Firebird Developer Guide - step-by-step examples for Delphi, Visual Studio, Java, PHP

In English: Beta version of Firebird Developer Guide (PDF)

In Russian: Download PDF

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