title: Help with a mysql query
body: <p>I'm sorry for the specificity of this question, but i've been up for 48h and my mind is probably void right now.</p>
  
  <p>so, I have a table -> id|userid|card<br>
  where a user can have multiple cards</p>
  
  <p>I just need to query the table to find the userid that have exactly 24 distinct cards (there are users with repeated cards).</p>
  
  <p>Can someone help me please?</p>
  
  <p>Thank you</p>