title: SQL Statement t1, t2 etc
body: <p>Im quite new to SQL and I'm just trying to find out what it means when you use t1, t2 or t3 etc...
  I cant get my head around it and would just like to learn about it. I've tried looking all over google but i've found nothing yet... Can you help?</p>
  
  <p>Thanks
  Mw</p>