Nette\Database\Table\Selection::select PHP Метод

    public function select($columns, ...$params)
    {
        $this->emptyResultSet();
        $this->sqlBuilder->addSelect($columns, ...$params);
        return $this;
    }

 /**
  * @param array $mapping
  */
 public function setMapping(array $mapping)
 {
     parent::setMapping($mapping);
     foreach ($mapping as $k => $m) {
         $this->selection->select("{$m} AS `{$k}`");
     }
 }