declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE TAXPOLV ADD PUNTOVENTA_ID NUMBER(7)'; 
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE TAXPOLV ADD PUNTOVENTA_CANCELAMENTO_ID NUMBER(7)'; 
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE TAXPOLV ADD TIPOPTOVTA_ID NUMBER(2)'; 
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE TAXPOLV ADD DESC_LOCAL_VENDA VARCHAR2(180)'; 
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE TAXPOLV ADD DESC_LOCAL_CANCELAMENTO VARCHAR2(180)'; 
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE TAXPOLV ADD UF_VENDA VARCHAR2(2)'; 
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE TAXPOLV ADD UF_CANCELAMENTO VARCHAR2(2)'; 
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE TAXPOLV ADD HORACANCELAMENTO VARCHAR2(5)'; 
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE TAXPOLV ADD NUMKMVIAJE NUMBER(7,2)'; 
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'ALTER TABLE TAXPOLV ADD DESCRUTA VARCHAR2(60)';
    exception when column_exists then null;
end;