How to create an incremental key in a Matrialized View created from Union?

I am trying to create some sort of incremental key in a materialized view that is formed from several Select and Union statements.
Why? My materialized view has a composite inteligent key of 5 columns. So, when I want to find a particular records, I don't want to have to do a select statement with some many WHERE and AND clauses.
The ROWNUM I tried didn't work (as I thought) because my Materialized view is made out of several union and each select statement of the UNION generates a new set of incremental numbers.
I also tried creating a SEQUENCE (I understand the sequence number will keep growing each time I do a refresh ) but it doesn't look like I can create a SEQUENCE on Matrialized View.
Anyone has any suggestion as how do I create some kind of incremental number in a materilized view created from an Union.
Thank you.
H

I'm assuming that this is a continusation of your earlier message
Re: Can I create Sequence on Materialized Views?
It doesn't seem to make sense, as others mentioned in that thread, to try to add this sort of key to a materialized view. Since the key would change every time you refreshed the materialized view, I'm having difficulty understanding how this will simplify your life. Your code would still have to refer to all 5 columns of the composite key since that would be the only constant.
Justin

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