Firebird is used by approximately 1 million of software developers worldwide. High compatibility with industry standards on many fronts makes Firebird the obvious choice for developing interoperable applications for homogeneous and hybrid environments.
Firebird RDBMS
The Firebird Project supplies users, developers, and administrators with various kinds of documentation, from Quick Start guides to expert-level articles devoted to various aspects of Firebird.

The 3 most popular documents every Firebird developer need to have handy is here:
Online Documentation Downloadable Version
Firebird 3.0 Quick Start Guide (English) PDF available
Firebird 2.5 Language Reference (English)
Latest build: 1.000 11 August 2017
PDF available
Firebird 3.0 Developer's Guide (English) PDF available

In the left menu you will find the detailed documentation divided into the following sections:
  • Release Notes — each Firebird release is accompanied by a "Release Notes" document, which contains the description of new features and fixed bugs. In this section, you will find all release notes.
  • Reference Manuals — this section contains Quick Start guides for new users and various guides devoted to specific topics.
  • White Papers & Presentations — in this section there are numerous white papers and presentations regarding Firebird-related topics. In this section, you can also find Firebird presentations from various conferences around the world.
  • FAQ — a collection of community FAQ links in English, Russian, Portuguese and another language.
  • Firebird Books — descriptions and links for purchasing several books devoted to Firebird.
  • Drivers Documentation — this section contains documents and links to documentation sets for Firebird drivers.
  • Third-Party Docs and Articles — a collection of various articles devoted to Firebird.
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