def insert_values(self):
        """
        SQL statement that inserts records without ID.
        """
        if self._insert_values is None:
            self._insert_values = self._prepare_insert(
                tmpl=self._insert_values_tmpl,
                placeholder_for_id=True,
                record_class=self.record_class,
                field_names=self.field_names,
            )
        return self._insert_values