declare 
  column_exists exception;
  pragma exception_init (column_exists , -01430);
begin 
  execute immediate 'ALTER TABLE CONF_RESTRICAO_CANALVENTA ADD EMPRESA_ID NUMBER(7,0)';
  exception when column_exists then null;
end;
/
declare
  dup_val_on_index  exception;
  except_02275  exception;

  pragma exception_init (dup_val_on_index  , -01430);
  pragma exception_init (except_02275  , -02275);
begin
  execute immediate 'ALTER TABLE CONF_RESTRICAO_CANALVENTA ADD CONSTRAINT FK_CONF_REST_CV_EMPRESA FOREIGN KEY (EMPRESA_ID) REFERENCES EMPRESA(EMPRESA_ID)';

  exception 
    when dup_val_on_index  then null;
    when except_02275  then null;
end;
/
declare 
  column_exists exception;
  pragma exception_init (column_exists , -01430);
begin 
  execute immediate 'ALTER TABLE CONF_RESTRICAO_CANALVENTA ADD FECINICIOVIGENCIA DATE';
  exception when column_exists then null;
end;
/
declare 
  column_exists exception;
  pragma exception_init (column_exists , -01430);
begin 
  execute immediate 'ALTER TABLE CONF_RESTRICAO_CANALVENTA ADD FECFINVIGENCIA DATE';
  exception when column_exists then null;
end;