title: Get the count of distinct userids for last couple of days
body: <p>Let's say the last 7 days for this table:</p>
  
  <pre><code>Userid   Download time
  Rab01    2020-04-29 03:28
  Klm01    2020-04-29 04:01
  Klm01    2020-04-30 05:10
  Rab01    2020-04-29 12:14
  Osa_3    2020-04-25 09:01
  </code></pre>
  
  <p>Following is the required output:</p>
  
  <pre><code>Count  Download_time
  1      2020-04-25
  2      2020-04-29
  1      2020-04-30
  </code></pre>