title: Remove duplicated pairs from SQL table
body: <p>I have a table sample is mentioned below:</p>
  
  <p><img src="https://i.stack.imgur.com/Oxh4A.png" alt="Sample dataset"></p>
  
  <p>This table basically has 2 duplicates i.e. the distance between Hyderabad and Bangalore same with Mumbai and Delhi.</p>
  
  <p>I want to remove these duplicates from my table. Is there a way to do this with SQL?</p>