title: MongoDB Query from Two collections
body: <p>I have two collections Players and Games:
  i. Players contains player id from 1-15.
  ii. Games contains games name:
      Hockey
      Cricket
      Badminton</p>
  
  <p>with player id from 1-11 from "Players" collection.</p>
  
  <p>Query for fetching all the games played by a specific player:
  e.g. Player 4 plays how many games with games names.</p>