title: Getting sum of rows based on column in oracle
body: <p>I want to sum of values of one column group by another column.
  e.g</p>
  
  <pre><code>Month     Count
  Jan         5
  Jan         7
  Feb         1
  Feb         2
  </code></pre>
  
  <p>I want</p>
  
  <pre><code>Month     Count   Status
  Jan         5       A
  Jan         7       B
  Jan        12      SUM
  Feb         1       A
  Feb         2       B
  Feb         3      SUM
  </code></pre>