title: How to sum a set of values that lie between a start date and an end date?
body: <p>I have created two dropdown list</p>
  <pre><code> 1. start date 
   2. end date
  </code></pre>
  <p>I am using MySQL database as a source and I have a table called <code>generation</code>
  having columns like (<code>date , generation, turbine_id</code>).</p>
  <p>After selecting the <code>start date</code> and <code>end date</code>, I need to sum the corresponding values that lie between the two dates:</p>
  <pre><code>sum({&lt;Date= {&quot;&lt;=$(=vStartDate)&gt;=$(=vEndDate)&quot;}&gt; } Target)
  </code></pre>