title: SQL: Need to select an answer which omits results which are not exclusive to categories
body: <p>Suppose my tables look something like this:</p>
  
  <pre><code>Manufacturer |Model         | Device type
  ----------------------------------------
  Test          001             Desktop
  Test          002             Laptop
  Test          003             Tablet
  Test2         004             Desktop
  Test2         005             Laptop
  Test2         006             Tablet
  Test3         007             Desktop
  Test3         008             Desktop
  Test4         009             Tablet
  Test4         010             Tablet
  
  model         |          price
  ------------------------------
  003                      100
  006                      150
  009                      175
  010                      190
  </code></pre>
  
  <p>How do I display:</p>
  
  <pre><code>Manufacturer
  ----------
  Test4
  </code></pre>
  
  <p>I'm only looking to display the names of manufacturers that produce Tablets exclusively. If a manufacturer produces any other type of device including tablets, I want to omit them from displaying. Test4 is the only one to produce tablets only, so that is the result I want.</p>
  
  <p>Thanks again for the help, I'm still pretty new to SQL and this would be a good help.</p>