title: How do I select only one row when there are multiple rows with the same business meaning?
body: <p>My table looks something like below:</p>
  
  <pre><code>From    To     Distance
  -----------------------
  ATL     NY     100
  NY      ATL    100
  DAL     NY     300
  NY      DAL    300
  DAL     MCI    200
  MCI     DAL    200
  </code></pre>
  
  <p>In this case the first two rows have the same business meaning and likewise the third and fourth (its basically the same routes but the from to varies based on the trip).</p>
  
  <p>I need the output to be like</p>
  
  <pre><code>ATL   NY    100
  DAL   NY    100
  DAL   MCI   200
  </code></pre>
  
  <p>The idea is I need only identical rows that has different business meaning. So I want either first or second row and third or fourth row.</p>
  
  <p>Thanks in advance for the help :)</p>