title: Difference in time between records
body: <p>I have a table that has (among others) a timestamp column (named timestamp; it's a standard Oracle DATE datatype).  The records are about 4-11 minutes apart, about 7 or 8 records every hour, and I'm trying to determine if there is any pattern to them.</p>
  
  <p>Is there an easy way to see each record, and the number of minutes that record occurred after the previous record?</p>
  
  <p>Thanks,
  AndyDan</p>