need help on the name of the column in double materialized view ORA-00957

I have a query, long enough and several (8ways) joins.

When I run it as a SQL query, it is fine.

When I add create materialized, view myViewName it errors with
ORA-00957: duplicate column name.

How is there is no problem when executing the SQL statement, and how to fix this?

Thank you.

Hello

Columns in a query do not need a unique name:

SELECT     dummy
,     dummy
FROM     dual;

D D
- -
X X

At least not in SQL * Plus; other front ends might oppose it.
In previous versions of Oracle, subqueries (such as online views) does not need to have unique names, but you've got an error if you tried to reference a non-unique column (and it is unnecessary to have the column if never reference you).

Columns in a table or a view need unique names:

CREATE OR REPLACE VIEW view_x
AS
SELECT     dummy
,     dummy
FROM     dual;

,     dummy
      *
ERROR at line 4:
ORA-00957: duplicate column name

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