giQuery->join() + giQuery->groupBy() implemented

join example :
$this->Core->Database->query()
			->select()
			->from('accounts')
			->join('profiles','accounts.id','profiles.id_account')
			->execute();

group example :
$this->Core->Database->query()
			->select(array('sum'=>'amount','0'=>'customer'))
			->from('orders')
			->groupBy(array('customer'))
			->execute();