How to create special column which represents result of a query

Hi all,
I need your help once more.
The situation is the following:
I have a table MESSAGE which has some billion entries. The columns are msg_id, vehicle_id, timestamp, data, etc.
I have another table VEHICLE which holds static vehicle data (about 20k rows) such as vehicle_id, licenceplate, etc.
My first target was to partition the table via timestamp (by range) and subpartition by vehicle_id (by hash).
So I could easily drop old data by dropping old partitions and tablespaces.
Now comes the new difficult 2nd target: the messages of some vehicles must be kept forever.
My idea is to add a column KEEP_DATA to the table MESSAGE. I could try to partition by timestamp AND KEEP_DATA, subpartion by vehicle_id.
The problem of this idea is that i have to update billions of rows.
It would be perfect if there is a possibility to add this KEEP_DATA-flag to the table vehicle.
Is there any way to "link" this information to a column in MESSAGE table?
I mean something like this:
alter table MESSAGE
add column (select keep_data from vehicle where VEHICLE.vehicle_id = MESSAGE.vehicle_id as keep_message) ;
Is there some possibility like that?
Would the partitioning on this column / statement work?
Would the value of the keep_message be calculated on runtime?
If so will the performance influence be noticeable?
If so will the performance also sink if the application is querying all rows except the keep_message?
Kind regards,
Andreas

What is your DB version?
The problem of this idea is that i have to update billions of rows. If this is your underlying problem then if you are in 11g and above you can use [url http://docs.oracle.com/cd/E14072_01/appdev.112/e10577/d_parallel_ex.htm]DBMS_PARALLEL_EXECUTE and split your update into multiple chunks and execute it parallel.
I mean something like this:
alter table MESSAGE
add column (select keep_data from vehicle where VEHICLE.vehicle_id = MESSAGE.vehicle_id as keep_message) ; As far as i know such a thing is not possible.

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