title: Mysql delete all rows (where col != this or col != that or col != otherthing)
body: <p>I am having trouble writing a query. Lets say I have a table full car makes and models, but I want to get rid of all of rows that are not associated with a list of models, I have written this...</p>
  
  <pre><code>DELETE FROM `cars` WHERE 
  `make` != 'Ford' OR
  `make` != 'Toyota' OR
  `make` != 'Cadillac'
  </code></pre>
  
  <p>However it is removing all of the rows. How do I write this so that I keep Ford, Toyota and Cadiillac, but delete Pontiac, Datsun and Renault?</p>
  
  <p>Thank you for your help on this!</p>