title: Group By with concatenate values with sum
body: <p>I have a table</p>
  
  <pre><code>ReferenceNo |  Description | Amount
  --------------------------------
      1222        abcd         30
      1223        efgh         10
      1223        ijkl         10
      1224        mnop         15
      1224        qrst          5
      1225        uvwx         33
  </code></pre>
  
  <p>I want output like this:</p>
  
  <pre><code> ReferenceNo |  Description | Amount
   --------------------------------
      1222        abcd         30
      1223        efgh ijkl    20                        
      1224        mnop qrst    20                     
      1225        uvwx         33
  </code></pre>
  
  <p>here <code>referenceNo</code> are repeated I want to add the amount and need to concatenate description group by referenceNo </p>
  
  <p>Please help me how to solve this problem</p>