Nette\Database\Table\SqlBuilder::addOrder PHP Method

    public function addOrder($columns, ...$params)
    {
        $this->order[] = $columns;
        $this->parameters['order'] = array_merge($this->parameters['order'], $params);
    }

 /**
  * Adds order clause, more calls appends to the end.
  * @param  string for example 'column1, column2 DESC'
  * @return self
  */
 public function order($columns)
 {
     $this->emptyResultSet();
     $this->sqlBuilder->addOrder($columns);
     return $this;
 }