title: Relational algebra for joining multiple tables
body: <p>I am looking for the relational algebra for this operation: "Select the make_name and model_name of all cars with the color_name white"</p>
  
  <p>Here I am attaching the schema of my tables
  <a href="http://i.stack.imgur.com/OXFYb.png" rel="nofollow">this is the schema of tables</a></p>