title: Select distinct rows in sql
body: <p>I have a table as follows:</p>
  
  <pre><code>id     fs_nature       Class   f_head
  ---------------------------------------
  1      Monthly           II     1
  2      Monthly           II     2
  3      Quarterly         II     1
  4      Quarterly         II     2
  5      Quarterly         II     3
  </code></pre>
  
  <p>Using sql query i want to pick rows like</p>
  
  <pre><code>Monthly     II
  Quarterly   II     
  </code></pre>
  
  <p>Is it possible.If yes then please show the query as i am very confused .</p>