title: MySQL importing updated data into database, with new and updated values
body: <p>When you are managing a database and you need to import new data as well as some of the previous data needs to be updated, but not all, what would be best practices to go about this? (ie. May 2022 is new, some products within Jan-April 2022 have updates in value, but not all and the data 2021-back doesn't need to be edited.)</p>