title: Having problems with writing sql query on SQL Server 2008
body: <p>i have this Table</p>
  
  <pre><code>1   a   d
  1   a   e
  2   b   f
  2   b   g
  3   c   h
  3   c   i
  3   c   j
  3   c   k
  </code></pre>
  
  <p>and i want to this result</p>
  
  <pre><code>1   a   d,e
  2   b   f,g
  3   c   h,I,j,k,l
  </code></pre>