How to define the Index on the column which is define in view (9i)

hi all,
I have one view which is based on to tables say 'customers' and 'vendors'
view definition is like:
create or replace view customer_vendor as
select customer_name, 'Customer' type from customers
union all
select vendor_name, 'Vendor' type form vendors;
my problem is that how i can define index on 'type' column if i used in where clause when i query the view.
Regards
s

An index is a pointer. A pointer to a data place.
Data result of a view aren't stored.
So, how an index may work against a view ?
SQL> create index idx1 on v1(type);
create index idx1 on v1(type)
ERROR at line 1:
ORA-01702: a view is not appropriate hereThink about mview instead of view, maybe that can help. Data result of mview are stored somewhere in database, so you are allowed to create an index against mview, like for table.
Anyway, if you want 'Customer', why not request onto customers table ?
Nicolas.

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