Oracle Database Version Query

SELECT * FROM V$INSTANCE;
SELECT * FROM V$VERSION;
select * from PRODUCT_COMPONENT_VERSION;


------Database Plateform Version Query------


declare
l_version varchar2(255);
l_compatibility varchar2(255);
begin
dbms_utility.db_version( l_version, l_compatibility );
dbms_output.put_line( l_version );
dbms_output.put_line( l_compatibility );
end;

 select dbms_utility.port_string from dual;