code: @Override
      public QNotIn appendSQL(final SQLSelect _sql)
          throws EFapsException
      {
          getAttribute().appendSQL(_sql);
          _sql.addPart(SQLPart.NOT).addPart(SQLPart.IN).addPart(SQLPart.PARENTHESIS_OPEN);
          getValue().appendSQL(_sql);
          _sql.addPart(SQLPart.PARENTHESIS_CLOSE);
          return this;
      }
docs: {@inheritDoc}