title: Returning most common linked ID for a user
body: <p>I have 3 tables. The <code>user_sticker</code> holds all sent stickers between users. When the profile view screen is loaded, i need to display which is the most common sticker that has been given to the user.</p>
  
  <p><strong>user</strong></p>
  
  <ul>
  <li>id_user</li>
  <li>name</li>
  </ul>
  
  <p><strong>sticker</strong></p>
  
  <ul>
  <li>id_sticker</li>
  <li>name</li>
  </ul>
  
  <p><strong>user_sticker</strong></p>
  
  <ul>
  <li>id_user_sticker</li>
  <li>id_sticker</li>
  <li>id_user_from</li>
  <li>id_user_to</li>
  </ul>
  
  <p>So, if <code>user_sticker</code> holds this info:</p>
  
  <ul>
  <li>1, 3, 254, 205</li>
  <li>2, 2, 362, 205</li>
  <li>3, 2, 519, 205</li>
  <li>4, 3, 945, 205</li>
  <li>5, 3, 199, 205</li>
  </ul>
  
  <p>(which means that users 254, 362, 519, 945, 199 sent stickers to user 205).
  The result has to return <strong>both</strong> the user 205 information (Name) and the most common sticker id (in this case #3) in the same record.</p>