Bulk Update Attribute Prices

[Altair]

I have download products that are priced solely by attribute. Is it possible to change product-attribute prices by a percentage or fixed amount? It is possible to update 1 product's prices and then copy to the Category or to selected products but the latter is tricky because the interface relies on highlighting products in what could be a very long list...

Thanks

[Ansley]

UPDATE `products_attributes` SET `options_values_price` = '15.0'
WHERE `options_values_price` = '10.0' AND `options_values_id` = '5'

UPDATE `products_attributes` SET `options_values_price` = '15.0'
WHERE `options_values_price` = '10.0' AND `options_values_id` = '6'

I looked in the table products_options_values for the options_values_id (products_options_values_id) and the corresponding products_options_values_name