Question on View

I want to create a view where one column is a combination of two columns (from two different tables).

i.e. course_id and sessions_id are both numbers, for example if course_id=123 and sessions_id=12345 I want test_id (on view) to look like 12312345 (and be a number).

create view test_vw
as select
to_number
'(substr(C.course_id,1,3)||''||substr(CE.sessions_id,1,5)','99999999') "test_id",
C.course_id,
CE.location_city,
from COURSES C, COURSES_SESSIONS CE;

What am I doing wrong here? (error is

ERROR at line 3:
ORA-00923: FROM keyword not found where expected) Received on Thu Sep 14 2000 - 08:59:44 CDT