declare
    object_exists exception;
    pragma exception_init (object_exists , -00955);
begin
	execute immediate 'ALTER TABLE MD_TOTALIZADOR ADD (ACTIVO NUMBER(1))';
	exception when object_exists then null;
end;
/

declare
    object_exists exception;
    pragma exception_init (object_exists , -00955);
begin
	execute immediate 'ALTER TABLE MD_TOTALIZADOR ADD (USUARIO_ID NUMBER(7))';
	exception when object_exists then null;
end;
/

declare
    object_exists exception;
    pragma exception_init (object_exists , -00955);
begin
	execute immediate 'ALTER TABLE MD_TOTALIZADOR ADD (FECMODIF DATE)';
	exception when object_exists then null;
end;