declare 
  object_exists exception;
  except_01451  exception;
  except_01442  exception;

  pragma exception_init (object_exists , -01430);
  pragma exception_init (except_01451  , -01451);
  pragma exception_init (except_01442  , -01442);
begin 
  execute immediate 'ALTER TABLE ESQUEMA_CORRIDA ADD (ISFLEXBUS NUMBER(1,0), OCUPACAO_MINIMA NUMBER(7,0), HORAS_CONFIRMACAO NUMBER(7,0), MINUTOS_CONFIRMACAO NUMBER(7,0)) ';
  exception 
    when object_exists  then null;
    when except_01451  then null;
    when except_01442  then null;
end;
/
declare 
  object_exists exception;
  except_01451  exception;
  except_01442  exception;

  pragma exception_init (object_exists , -01430);
  pragma exception_init (except_01451  , -01451);
  pragma exception_init (except_01442  , -01442);
begin 
  execute immediate 'ALTER TABLE CORRIDA ADD (ISFLEXBUS NUMBER(1,0), STATUSFLEXBUS NUMBER(1,0),  OCUPACAO_MINIMA NUMBER(7,0), HORAS_CONFIRMACAO NUMBER(7,0), MINUTOS_CONFIRMACAO NUMBER(7,0), USUARIOFLEXBUS_ID NUMBER(7,0)) ';
  exception 
    when object_exists  then null;
    when except_01451  then null;
    when except_01442  then null;
end;
/
declare 
  object_exists exception;
  except_01451  exception;
  except_01442  exception;

  pragma exception_init (object_exists , -01430);
  pragma exception_init (except_01451  , -01451);
  pragma exception_init (except_01442  , -01442);
begin 
  execute immediate 'ALTER TABLE PUNTO_VENTA ADD (INDRESERVAFLEXBUS NUMBER(1,0)) ';
  exception 
    when object_exists  then null;
    when except_01451  then null;
    when except_01442  then null;
end;