gistfile1.txt

$result = Mage::getModel('customer/customer')->getCollection()
                ->join(array('pet' => $this->getTable('partners_earn_transactions')), $this->getTable('customer_entity').'.entity_id = `pet`.customer_id')
                ->addExpressionFieldToSelect('transaction_count', 'COUNT({{pet.id}})')
                ->addAttributeToFilter('country_id', $country_code)
                ->addFieldToFilter('is_active', 1)
                ->addAttributeToSort('COUNT({{pet.id}})')
                ->addAttributeToSort('SUM({{pet.points}})')
                ->groupByAttribute($this->getTable('customer_entity').'.entity_id')
                ->limit(5)
                ->load();