public function groupBy($sql, $params=array())
    {
        $binder = new Binder();
        $this->_group = $binder->magicBind($sql, (array) $params);

        return $this;
    }
public function groupBy($sql, $params=array())
    {
        $binder = new Binder();
        $this->_group = $binder->magicBind($sql, (array) $params);

        return $this;
    }
public function groupBy ( $ sql , $ params = array ( ) ) { $ binder = new Binder ( ) ; $ this -> _group = $ binder -> magicBind ( $ sql , ( array ) $ params ) ; return $ this ; }
Adds an group by clause
@chainable
Adds an group by clause