declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'alter table ocd add( NUMTARJETA VARCHAR2(48 BYTE),
NUMAUTORIZACION VARCHAR2(45 BYTE),
NSU VARCHAR2(18 BYTE))';
    exception when column_exists then null;
end;
/
declare
    column_exists exception;
    pragma exception_init (column_exists , -01430);
begin
    execute immediate 'alter table OCD_PARAM add INDOCDDINHEIRO number(1) default 1';
    exception when column_exists then null;
end;