CREATE OR REPLACE FUNCTION public.largest_polygon1(
geom1 geometry,
geom2 geometry)
RETURNS geometry
LANGUAGE 'plpgsql'
COST 100
VOLATILE
AS $BODY$
begin
Return
Case
When ST_Area(geom1) > ST_Area(geom2) Then geom1
else geom2
End;
End;
$BODY$;
ALTER FUNCTION public.largest_polygon1(geometry, geometry)
OWNER TO postgres;
begin return Case When ST_Area(geom1) > ST_Area(geom2) Then geom1 else geom2 End; End;
Then after using this I got the answer now.