> The firebird rdb$fields stores nullability value of the domain/column. Then
> the rdb$relation_fields ALSO store the nullability value of the
> domain/column (this looks like the actual override). So firebird still doesn't
> support overriding the not null constraint on the domain???

You make it sound like this is a problem. It is completely expected and appropriate.

If you want to allow NULLs then define a new domain.


Sean