code: @Override
      public int append2SQLSelect(final Type _type,
                                  final SQLSelect _select,
                                  final int _tableIndex,
                                  final int _colIndex)
      {
          int ret = 0;
          if (_type.getMainTable().getSqlColType() != null) {
              _select.column(_tableIndex, _type.getMainTable().getSqlColType());
              getColIndexs().add(_colIndex + ret);
              ret++;
          }
          this.type = _type;
          return ret;
      }
docs: {@inheritDoc}