title: IN, GROUP BY and get AVG with JPA
body: <p>There are two tables Feedback and Services.</p>
  
  <pre>
  feedback                        
  --------------------
  rating | services_id  
  
    3  |      1                
    4  |      1                
    2  |      2                
  
  Services 
  ------------------------
  id  |    name
   1  |   Travel
   2  |   Hostel
   3  |   Food
  
  </pre>
  
  <p>How I get ordered list of services according to rating?</p>