If you have an existing table, you can follow these steps: See also: How to create an autoincrement column? Using FlameRobinįlameRobin also provides tooling to create a sequence + trigger for you. To create a trigger to always generate the id on a table T1 with primary key ID: set term !! To create a sequence: CREATE SEQUENCE t1_id_sequence Sequence is the SQL standard term and generator is the historical Firebird term both terms are available in the Firebird DDL syntax. You need to create them yourself with a sequence (aka generator) and a trigger. Firebird 2.5 and earlierįirebird 2.5 and earlier do not have auto-increment fields. See also the Firebird 3 release notes, section " Identity Column Type", and the Firebird 4.0 Language Reference, section " Identity Columns (Autoincrement)". Id integer generated by default as identity primary keyįirebird 3 only supports " generated by default", which means users are able to specify their own id values (which might lead to duplicate value errors) " generated always" has been added in Firebird 4. In practice it is syntactic sugar for generating a sequence + trigger (as shown for Firebird 2.5) for you. In Firebird 3 it is easy to create, as it introduced identity columns.
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