title: Summing up a column based on multiple Criterion
body: <p>Basically</p>
  
  <p>Column 1 contains many names,<br>
  Column 2 contains the Unique version of those many names,<br>
  Column 3 contains either 1 or 0</p>
  
  <p>I want to sum the values in Column 3 based on Column 1 matching Column 2</p>
  
  <p>EG</p>
  
  <pre><code>A        B        C
  VBA     VBA       1
  VBA     XY        0
  XY      ZX        1
  ZX                1
  XY                1
  VBA               0
  XY                1
  ZX                1
  </code></pre>
  
  <p>So I want it to produce a 4th column equal in length to Column B as follows</p>
  
  <pre><code>VBA    1
  XY     3
  ZX     2
  </code></pre>
  
  <p>I've tried a few different ways and I just cant seem to get it to work.
  Any help would be much appreciated</p>