All polygons in a unique multipolygon

Question

I know maybe this is an easy problem, but I searched everywhere and not find the answer.
I have a table with many polygons. How can I make a query that returns me only one register which is a multipolygon including all the polygons? I'm not talking about SDO_UNION and SDO_AGGR_UNION, because these return me a polygon with the orignal polygons merged. I want they together in a multipolygon, but not merged.
Thanks in advanced.

Answer 1

Hi,
I didn't look at Luc's code. However, I modify my function to include the table name and geometry column name in the function. You can use the function on views or tables. It is not an aggregrate function but should do what you want.
Jack
create or replace function multi_polygon_w_table(table_name varchar2, geom_col_name varchar2)
return sdo_geometry
is
mpoly_geom sdo_geometry := null;
TYPE t_cursor is REF CURSOR;
cur t_cursor ;
geom sdo_geometry := null;
sql_stmt varchar2(256);
begin
sql_stmt := 'select ' || geom_col_name || ' from ' || table_name ;     
open cur for sql_stmt;      
loop
fetch cur into geom;
exit when cur%NOTFOUND;
mpoly_geom := sdo_util.append(mpoly_geom,geom) ;
end loop;
return mpoly_geom;
end multi_polygon_w_table;
select multi_polygon_w_table('POLYGON_TABLE','GEOMETRY') from dual;