declare
    object_exists exception;
    pragma exception_init (object_exists , -00955);
begin
	execute immediate 'ALTER TABLE AG_ADIANTAMENTO_CLIENTE ADD (CLIENTECNPJCPF VARCHAR2(20))';
	execute immediate 'ALTER TABLE AG_ADIANTAMENTO_CLIENTE ADD (CLIENTEIDWS VARCHAR2(30))';
	execute immediate 'ALTER TABLE AG_ADIANTAMENTO_CLIENTE ADD (OBSERVACAO VARCHAR2(255))';
    exception when object_exists then null;
end;