Location based query not working Urgent!!!

Question

Hi
I m using orcacle8.1.6 and i m not able to execute the foll query..
select /*+ordered*/ c.customer_id,
c.cust_first_name,
c.cust_last_name,
sdo_nn_distance (1) distance from warehouses w,
customers c where w.warehouse_id = 2
and sdo_nn (c.cust_geo_location, w.wh_geo_location, 'sdo_num_res=5', 1) = 'TRUE'
order by distance;
Its giving me error @ sdo_nn_distance as invalid column name...i think it might be problem with version..
if its so...
can somebody suggest me a query to fetch five customers closest to the warehouse whose warehouse ID is 2 in this case...
Thanks in advance..

Answer 1

As you've guessed, this is a version issue. You need to be running 9i to have access to sdo_nn_distance.
You should be able to do this in 8.1.6:
select /*+ordered*/ c.customer_id,
c.cust_first_name,
c.cust_last_name,
sdo_geom.sdo_distance(cust_geo_location,a.diminfo, wh_geo_location,b.diminfo) distance
from warehouses w, customers c,
user_sdo_geom_metadata a, user_sdo_geom_metadata b
where w.warehouse_id = 2
and sdo_nn (c.cust_geo_location, w.wh_geo_location, 'sdo_num_res=5', 1) = 'TRUE'
and a.table_name='CUSTOMERS'
and a.column_name='CUST_GEO_LOCATION'
and a.table_name='WAREHOUSES'
and a.column_name='WH_GEO_LOCATION'
order by distance;