/**
  * Render WHERE clause
  *
  * @param string $sql
  *            SQL query
  * @return string
  */
 protected function _renderWhere($sql)
 {
     if ($this->_parts[EhrlichAndreas_Db_Sql::UPDATE] && $this->_parts[EhrlichAndreas_Db_Sql::WHERE]) {
         $sql = parent::_renderWhere($sql);
     }
     return $sql;
 }