title: MySQL select top 10% of users
body: <p>I have a simple MySQL db listing the total time spent each user has spent online in seconds (just a string) per day. I would like to select the top 10% of those users for a given day and return there usernames. </p>
  
  <p>Is there a way to do this in MySQL in a single query..? I've seen examples where you select the top 10 users, but not based on a percentage of total users...</p>