/* 9 = attribute set Id */
select
	increment_id,
	created_at,
	entity_id 
from
	sales_flat_order 
where
	entity_id not in (
		SELECT
			o.entity_id      
		FROM
			sales_flat_order o      
		LEFT JOIN
			sales_flat_order_item i        
				ON o.entity_id = i.order_id      
		LEFT JOIN
			catalog_product_entity p        
				ON i.product_id = p.entity_id      
		WHERE
			p.attribute_set_id = 9
	)

$attributeSetModel = Mage::getModel("eav/entity_attribute_set");
$attributeSetModel->load($product->getAttributeSetId());
$attributeSetName  = $attributeSetModel->getAttributeSetName();