What are SQL dialects and which one to use?

SQL dialect were used for migration between InterBase 5 and Firebird 1. Dialect 1 enables legacy applications to talk to Firebird as if it was InterBase 5. Dialect 2 is used for transition and dialect 3 is supports all the new features.

If you're writing a new application, you should use Dialect 3 for all your databases.

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