- Column names are limited to 30 characters
- Index names are limited to 31 characters.
On some dbms the index name contains both table name and actual index name
so the limit applies to the sum of the lenghts of table name and index name.
- Auto incremented column names are limited to 26 characters to provide an
additional 4 characters for sequence names
The code for firebird auto increment support using generators/sequences with
triggers was copied from create_schema_files.php
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