title: MySQL SELECT COUNT GROUP
body: <p>I have table "orders" with column ID (id order) and IDU (id user).
  I want calculate like this:</p>
  
  <pre><code>50 person have 1 order
  30 person have 2 order
  etc...
  </code></pre>
  
  <p>My code (bad)</p>
  
  <pre><code>SELECT DISTNICT count(id), count(idu)  FROM orders GROUP BY idu
  </code></pre>
  
  <p>Please help me :)</p>