title: Counting without duplicates
body: <p>I have a table such as the following</p>
  
  <pre><code> FK_OrgId , FK_UserId
   3 , 74
   1 , 74
   1 , 74
   3 , 4
   4 , 5
   1 , 5
  </code></pre>
  
  <p>I'm trying to count FK_OrgId but I have to eliminate duplicates. So, I want a result like</p>
  
  <pre><code> FK_OrgId, count
   3 , 2
   1 , 2
   4 , 1
  </code></pre>
  
  <p>Any suggestions?</p>