title: Which is the best method for efficiency/less work load on server
body: <p>I am curious to know what would be the preferred method for a table which would store a list of IDs associated with a UserID.</p>
  
  <p>Should I have one field storing a serialized array of all the id's (one row per UserID)</p>
  
  <p>Or one row for every id for every player? Is the answer clear cut or are there factors to take into account when making such a decision?</p>
  
  <p>Hope you can help explain the best choice.</p>