declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE ESTACION ADD (INDBPE NUMBER(1) DEFAULT 0)';
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE EMPRESA_IMPOSTO ADD (INDBPE NUMBER(1) DEFAULT 0)';
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE BPE ADD (INDBPEEMPRESA NUMBER(1))';
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE BPE ADD (INDBPEESTACAO NUMBER(1))';
    exception when column_exists then null;
end;