title: Redis - Get the aggregated score from three sorted set
body: <p>i have three sorted sets:</p>
  
  <p><code>setA {play1: 100, play2: 150, play3: 230}
   setB {play1: 120, play4: 100, play5: 200}
   setC {play1: 110, play3: 150, play5: 30}</code></p>
  
  <p>Is it possible to get an aggregated result (sum the score for the same user in different sets and display all of users scores in the result) of the three sorted sets?</p>
  
  <p>thanks!</p>