I think what I am going to do is create a new table '_import_products' to import the ProductSKU and ProductPrice, then compare SKU's between _import_products and ps4_products and where the SKU's match I will simply overwrite the old price with the new one from _import_products.
Any products that don't exist in the new imported info won't overwrite prices in the existing ps4_products.
It'll be a two or three step process I think... import into _import_products, then compare and replace prices, then possibly check those records updated.
I'll let you know how it goes, but I don't think it's something that can be done via a webpage unless it's MyAdminPHP. I reckon it has to be done with the MySQL shell or a GUI.
