> The SERIAL data type is not automatically a unique column.
> You must apply a unique index to this column to prevent
> duplicate serial numbers. If you use the interactive schema
> editor in DB-Access to define the table, a unique index is
> applied automatically to a SERIAL column.
>
> http://www.informix.com/answers/english/pdf_docs/gn7382/4366.pdf
>
> You can specify a nonzero value for a serial column
> (as long as it does not duplicate any existing value in that column), ...
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> ?!!!
You can assign a value to a serial column, as long as it is unique.
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