title: Access DSUM Issue
body: <p>I am trying to use Dsum function in a query field to create subtotals of volume per each channel</p>
  
  <p>Exp1: DSUM("[vol_tot]","[TBLNAME]","[CH]")</p>
  
  <p>I have the following results:</p>
  
  <pre><code>CH Exp1
  10 200,000
  20 200,000
  30 200,000
  </code></pre>
  
  <p>I was expecting:</p>
  
  <pre><code>CH Exp2
  10 100,000
  20 40,000
  30 60,000
  </code></pre>
  
  <p>I'm trying to attain the same functionality as a SUMIF function in Excel...</p>