Creating a view with order by condition

Question

Hi all.
I'm on db 11g.
I have a doubt: is it possible to create a view using both group by and order by conditions?
It is like this:
create or replace view some_view
as select col1,col2,col3, sum(col4),sum(col5)
from table_name
where.....
group by col1, col2, col3
order by col1, col2;The problem is that if I put order by conditions it gives me error; if I write those statements without order by condition everything is ok.
Someone can help me?
Thanks for collaboration,
Fabrizio

Answer 1

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Restrictions on the Defining Query of a View The view query is subject to the following restrictions:
* The subquery cannot select the CURRVAL or NEXTVAL pseudocolumns.
* If the subquery selects the ROWID, ROWNUM, or LEVEL pseudocolumns, then those columns must have aliases in the view subquery.
* If the subquery uses an asterisk (*) to select all columns of a table, and you later add new columns to the table, then the view will not contain those columns until you re-create the view by issuing a CREATE OR REPLACE VIEW statement.
* For object views, the number of elements in the subquery select list must be the same as the number of top-level attributes for the object type. The datatype of each of the selecting elements must be the same as the corresponding top-level attribute.
* You cannot specify the SAMPLE clause.
* You cannot specify the ORDER BY clause in the subquery if you also specify the subquery_restriction_clause.
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http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_8004.htm#SQLRF01504