Generate DDL - change is a new column and I want to generate a alter table

Morning all,
I have searched and looked all over the data modeler and I cannot find this option ... yet I did find it easily in Designer.
I hope you can help me.
SQL Developer Data Modeler v3.0.0.665.
I have added a new column to a table and when I generate the DDL I would like it to be an alter table add column rather than a create table.
This feature is in Designer so I would think it would be in data modeler.
Just incase my description is not clear here are the high level steps so it is clear.
1. create the logical model
2. create the relational from the logical.
3. create the physical from the relational.
4. generate DDL and run in database. At this point I go to production with my system and all is well.
5. At this point we have an enhancement request. For the model it will be a new column in a table.
6. update logical model.
7. update relational from logical
8. update physical from relational
9. generate DDL. Here I would like to have the generate be aware the it needs only to generate an alter table add column and not create the table.
This is something I do alot as all my models are in production. I cannot find how to do this step of getting data modeler to generate the alter.
Designer does this exceptionally well.
Quite often it is more than a single column. The changes can be many and made over time and at the time of generating the DDL you may not recall every single change you made. To have the tool discover those changes for you and generate the appropriate DDL is a feature I regard as very high.
I hope this is clear and you can help me.
Cheers
Chris ....

Hi Chris,
you need to compare your model against database - import from database into same relational model and use "swap target" option - in this case "alter statements" against database will be generated.
You can look at demonstrations here http://www.oracle.com/technetwork/developer-tools/datamodeler/demonstrations-224554.html
Probably this particular one will be most helpful http://download.oracle.com/otn_hosted_doc/sqldev/importddl/importddl.html
Soon or later your changes will require table to be recreated and you'll need to backup your data - you can consider usage of "Advanced DDL" option - script will be generated that will unload the content of your table (including LOBs) to file system accessible from database and restore it after changes. Well don't try it directly on production system :).
Philip

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Generate DDL - change is a new column and I want to generate a alter table

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