SDO_UNION AGGREGATION ROUTINE

Question

I am in search of a routine to perform aggregations of grouped data using the sdo_union function. Using the procedure below, a recordset is created from my ZIP_TEMP table WHERE State='NY'...(basically I'm trying to create a New York object from all of the zip codes therein)...and it loops through the recordset aggregating the objects. The procedure runs to completion, but it only creates on point...not even an object. Any takers?
create or replace procedure agg_union
as
cnt number := 0;
result_geoloc mdsys.sdo_geometry;
cursor c1 is
SELECT GEOLOC FROM ZIP_TEMP WHERE STATE = 'NY';
diminfo mdsys.sdo_dim_array;
begin
SELECT diminfo INTO diminfo
FROM user_sdo_geom_metadata
WHERE table_name = 'ZIP_TEMP'
AND column_name = 'GEOLOC';
for r in c1 loop
cnt := cnt + 1;
if (cnt = 1)
then
result_geoloc := r.geoloc;
else
result_geoloc :=
mdsys.sdo_geom.sdo_union (r.geoloc, diminfo, result_geoloc, diminfo);
end if;
end loop;
INSERT INTO NY VALUES (1, result_geoloc);
commit;
end;
/

Answer 1

Daniel,
Your example looks like an example we recieved from an Oracle Spatial employee. Is this true?
If not, I can e-mail the example we recieved.
We are using SDO_Union successfully, but only after using the Validate_Layer to verify that our geometries were valid. Until we had our data in Oracle correctly, we were unable to use SDO_Union and SDO_Difference.
Our goemetries are now 2-d(x,y) instead of 3-d(x,y,z) which uses 25% less space.
Thomas LeBlanc
[email protected]