title: Grouping by two fields on same line
body: <p>Very to to this so apologies if this very basic or I miss some detail</p>
  
  <p>I have the query</p>
  
  <pre><code>select   #FBorders1.QuestCode
      ,COUNT(Distinct #FBOrders1.CustomerID)as UniqueCust
  from #FBOrders1
  group by #FBOrders1.QuestCode
  </code></pre>
  
  <p>This show unique Customers to have ordered a specific stock item (QuestCode)</p>
  
  <p>I now need to show how many of those unique customers have placed 2, 3 or 4 orders.. the 2nd, 3rd, 4th orders will not have a QuestCode recorded against them</p>
  
  <p>Table consists of OrderID, CustomerID, QuestCode</p>
  
  <p>Thanks in advance</p>