title: Joining two database tables with django
body: <p>I am doing several measurements of voltage, resistance, frequency, etc. of a device.
  I want to have a table for each measurement as well as a main table with the serial number of the device and boolean values if it has passed the tests.</p>
  
  <p>I planned to have the structure similar to this:</p>
  
  <pre><code>create table volt(serial char(20),v1 float(10),v2 float(10)....)
  create table resistance(serial char(20),r1 float(10),r2 float(10)....)
  create table device(serial char(20),freq boolean(),tx boolean....)
  </code></pre>
  
  <p>I admit to not having a lot of experience with django and I have no idea how to create a model like this. I tried making seperate classes and using foreignKey, but for that I'd have to create the resistance and volt measurements first.</p>
  
  <p>It is possible to store the measurement values as comma seperated strings as well, but I'd rather have it in a proper database.</p>
  
  <p>Any hints?</p>