There are also ways to do updates on prices in part or as a whole depending on what the criteria is ...

For example, update all prices by plus 10% is a single command ...

Update all prices in a given category where the category is the master_categories_id can also be done with a single command per master_categories_id ...

Updating both prices and attributes can be done with a bit of coding ...

For other things, programs like EP might be useful ...