title: Import and overwrite existing data in MySQL
body: <p>I have data in a MySQL table with a unique key. I want to import more recent data that is stored in a CSV at the moment. I would like it to overwrite the old data if the key already exists, or create a new row if the key does not exist. Does anyone know how to this in MySQL?</p>
  
  <p>Thank you for your help!</p>
  
  <p>Jeff</p>