title: How can I select the max value of a column based on other column values?
body: <p>I'm looking at a table that is set up sort of like this: </p>
  
  <pre><code>Month  |  Year  |  Item  
  1      |  2016  |  a
  1      |  2016  |  b
  1      |  2016  |  c
  2      |  2016  |  a
  2      |  2016  |  b
  2      |  2016  |  c
  3      |  2016  |  a
  3      |  2016  |  b
  </code></pre>
  
  <p>The I want to get the highest month and year values when a, b, and c are all present, in this case 2, 2016. </p>