title: Saving a changing amount of Values in a SQL-Database
body: <p>i am really stuck at this point of my android app development.
  What i need is a way to save a changing amount of int or string-values (in a sql database). Yet im not even sure if this is the right approach, but let me explain:</p>
  
  <p>In the app i am currently working on, you are able to create certain "events". Users should be able to apply for such events.</p>
  
  <p>I have an external database with 2 tables: </p>
  
  <ol>
  <li>first one for users - every user has a unique ID</li>
  <li>second one for events - every event has a unique ID</li>
  </ol>
  
  <p>I need each event to know what users applied for it. And i need each user to know what events they applied for. 
  I was thinking to save the Event-IDs in the User-Table and vice versa.</p>
  
  <p>I just dont know how to do that since the amount of applicants/ID's can change. Is there a way to save Arrays in the database which can easily be edited (e.g. +/- one ID) and read? </p>
  
  <p>Is this even the right way? I am very happy for any advise!</p>
  
  <p>Thanks in advance!</p>