title: Fetch first row only with IN operation in DB2
body: <p>how do i use "fetch first row only" in combination with "in" operator? something like </p>
  
  <pre><code>select user_id, item_name as last_item_name 
  from sale 
  where user_id in (1,2) 
  order by date desc 
  fetch first row only
  </code></pre>
  
  <p>which i want it to returns the last item each person buy?
  eg: running the query on</p>
  
  <pre><code>--------------------------------
  id | user_id | item_name| date |
  1  | 1       | pen      | 01/01|
  2  | 1       | book     | 02/01|
  3  | 2       | book     | 01/01|
  4  | 2       | computer | 02/01|
  --------------------------------
  </code></pre>
  
  <p>should return</p>
  
  <pre><code>user_id | last_item_name|
  1       | book          |
  2       | computer      |
  -------------------------
  </code></pre>
  
  <p>Thanks!</p>