oracle compare tables in 2 schema

SYS.sf_compTablesInschemas

CREATE OR REPLACE FUNCTION SYS.sf_compTablesInschemas
(

   pvchTablename        IN VARCHAR2,
   pvchSchema1    		in varchar2,
   pvchSchema2    		in varchar2
) 
return varchar2
IS
asd int;
begin  
select Count(*)  into asd 
fROM (
	   select TABLE_NAME, COLUMN_NAME, DATA_TYPE, DATA_LENGTH, DATA_PRECISION , data_SCALE, nullable  
	   		  from DBA_TAB_COLS 
			  where table_name = pvchTablename 
			  		and owner = pvchSchema1
minus 
	  select TABLE_NAME, COLUMN_NAME, DATA_TYPE, DATA_LENGTH, DATA_PRECISION , data_SCALE, nullable   
	  		 from DBA_TAB_COLS 
			 where table_name = pvchTablename  
			 and owner =pvchSchema2
	)
;
if asd > 0 then 
return 'false';
else 
return 'true'; 
end if ;



end ;