Use of several spatial operators in one select

Question

I am using Oracle 10g 10.1.0.2.0
I have two tables State and County with spatial attributes. County has foreign kay to corresponding state:
CREATE TYPE STATE_TYPE AS OBJECT (
Geometry mdsys.sdo_geometry,
Name VARCHAR2(25),
Population NUMBER(10),
Area NUMBER,
MainActivity VARCHAR2(50),
Capital VARCHAR2(25) );
create table State of State_Type (
constraint StatePK primary key (Name))
object identifier is system generated;
create type CountySpa_Type as object (
Geometry mdsys.sdo_geometry,
Name varchar2(25),
Area number,
MainActivity varchar2(50),
StateRef REF State_Type);
create table CountySpa of CountySpa_Type (
constraint CountySpaPK primary key (Name),
constraint CountySpaFK foreign key (StateRef) references State);
I want to check that the geometry of State and geometric union of corresponding counties is equal. I already found no very nice solution but cannot understand why in the following Oracle gives me an error of invalid identifier GU
select S1.Name
from State S1, (
Select sdo_aggr_union(sdoaggrtype(C.Geometry, 0.005))
from CountySpa C, State S2
where C.StateRef = ref(S2) and S2.Name = ‘NewState’) GU
where sdo_geom.relate(S1.Geometry, ‘EQUAL’, GU, 0.005)= ‘EQUAL’;

Answer 1

Hi.
If somebody is interested I found the solution. Conntact me if you want an explanation
Select S1.Name
From State S1, (
Select S2.Name as SName, sdo_aggr_union(sdoaggrtype(C.Geometry, 0.005)) as Geometry
from CountySpa C , State S2
where C.StateRef = ref(S2)
group by S2.Name ) GU
Where GU.SName = S1.Name and sdo_geom.relate(S1.Geometry, ‘EQUAL’, GU.Geometry, 0.005)= ‘EQUAL’;