Duplicate Column Name: VIEW

Question

Hi. Im writing a VIEW:
CREATE OR REPLACE VIEW viewexample AS
SELECT c.customer_id, c.details, o.order_id,
o.details, op.product_id, op.description
FROM customer c, order o, order_product op
(...more... )
Yet, i get this message:
duplicate column name
And its pointing to line 3. Any ideas?

Answer 1

A problem has arisen.
I have developed this View further but it seems im getting a Cartesian product.
I am not tip-top on joins, but i included some inner joins that i thought would not return a Cartesian.
Here is the code:
CREATE OR REPLACE VIEW myview AS
     SELECT      co.order_id,
          o.description o_d,
          co.customer_id,
          cp.product_description,
          c.name c_n
     FROM     customer_order co, order o, customer c,
          customer_product cp
     WHERE     cp.product_description BETWEEN
          '000' AND '010'
     AND      co.order_id = o.order_id
     AND     co.customer_id = c.customer_id;
with the select statment:
select * from myview;
I am expecting 10 selections, yet i recieve about 1000.
Any ideas?