title: comparing data from mysql backups
body: <p>I've got a few backups of my database, and I'm trying to figure out if there is a way to compare the data in the backups to see how the data as changed over time. 
  I do not have a timestamp on the fields I want to compare, but I do have a unique id on the row. The backups are .sql files created by using mysqldump. </p>
  
  <p>Is there a process for doing this?</p>