Way to add an additional column that acts as a PK in a Materialized View?

I want to create a materialized view that also has an index column. A unique number sequence assigned to each record. Is this even possible? Can a materialized view do this, and would the indexes stay the same on a refresh?
Any help would be greatly appreciated.

Materialized views are copies of data or aggregations. They can be used to replicate all or part of a table, or to replicate the result of a query against multiple tables. The big advantage they have is that unlike a standard view, which can return the same data, you can index the materialized view to improve performance. These indexes will be maintained and updated during the refresh process.
Refer to Metalink document: 76673.1 or the Oracle Concepts manual for more information.

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