title: mysql check if numbers are in a comma separated list
body: <p>I have a table like this:</p>
  
  <pre><code>UID(int) NUMBERS(blob)
  ----------------------
  1        1,13,15,20
  2        3,10,15,20
  3        3,15
  </code></pre>
  
  <p>And I would like to test if 3 and 15 are in the blob called NUMBERS. And can see the LIKE %% cannot be used</p>
  
  <p>Only row with ID 2 and three scoulb be selected...</p>