How to reproduce FME Change Detector results in PostGIS?

we would like to use the function change detector from FME in PostGIS.

We had a try with the following SQL-Statements but the function doesn´t work. There are no results in the end. The single querys for added/deleted/unchanged are working but the problem with the function we´ve got are the two loaded layers. So does anybody now if there is a possibility to create an change detector function in PostGis? The result should create, depending on the data, one to three new layers (added/deleted/unchanged).

drop table if exists tab_cd_2;
create table tab_cd_2(
gid serial PRIMARY KEY,
nume varchar,
nume1 varchar,
nume2 varchar,
geom geometry(polygon, 32633));


CREATE OR REPLACE FUNCTION cd_3() RETURNS trigger AS

$$ begin

for NEW.nume in select count(landkreise_projected_added.name_3)
From public.landkreise_projected_added
 Where not exists (select geom from landkreise_projected_added
 where landkreise_projected_added.geom = landkreise_projected_deleted.geom)
loop

select count(landkreise_projected_added.name_3)
into tab_cd_2.nume1
FROM public.landkreise_projected_added
WHERE NOT EXISTS (SELECT geom FROM landkreise_projected_deleted
 WHERE landkreise_projected_deleted.geom = landkreise_projected_added.geom);

begin
select count(landkreise_projected_added.name_3)
into tab_cd_2.nume2
FROM public.landkreise_projected_added
WHERE landkreise_projected_added.geom = landkreise_projected_deleted.geom;
end;

end loop;
RETURN tab_cd_2;
END;
$$ LANGUAGE 'plpgsql';  

--  Trigger 
DROP TRIGGER IF EXISTS fill_sp ON tab_cd_2;
CREATE TRIGGER fill_cd_3
BEFORE INSERT OR UPDATE ON tab_cd_2
FOR EACH row EXECUTE PROCEDURE cd_3();

Thanks for your help!