title: Find overlapping (date/time) rows within one table
body: <p>I have a table which stores in each row a meeting with start date/time and end date/time.</p>
  
  <p>meetingID    int<br>
  meetingStart datetime<br>
  meetingEnd   datetime</p>
  
  <p>Desired output:
  For each pair of overlapping rows I would like to output<br>
  meetingID, meetingStart, meetingID, meetingEnd </p>
  
  <p>What's the most efficient way to perform such a query in MySQL?</p>