title: Get the SUM of one column when grouped by another column in SQL
body: <p>I have a table with 3 fields</p>
  
  <pre><code>ID  Tax   State
  0   .50   TX
  1   .25   TX
  2   .25   AZ
  3   .25   AZ
  4   .1    AL
  </code></pre>
  
  <p>I want to pull the sum of Tax for each state.</p>
  
  <pre><code>Tax   State
  .75   TX
  .5    AZ
  .1    AL
  </code></pre>
  
  <p>How would I write a query to do this?</p>