Magento - Add Newset sort option

magento-add-newest-sort-option.sql

UPDATE `catalog_eav_attribute`
SET `used_for_sort_by` = 1
WHERE `attribute_id` = (SELECT `attribute_id` FROM `eav_attribute` WHERE `entity_type_id` = (SELECT `entity_type_id` FROM `eav_entity_type` WHERE `entity_model` = "catalog/product") AND `attribute_code` = "created_at");

UPDATE `eav_attribute`
SET `frontend_label` = "Newest"
WHERE `entity_type_id` = (SELECT `entity_type_id` FROM `eav_entity_type` WHERE `entity_model` = "catalog/product" AND `attribute_code` = "created_at");