title: SQL Query where a field value does not contain empty spaces
body: <p>I am currently using the follow query: </p>
  
  <pre><code>SELECT *
  FROM `wp_usermeta`
  WHERE meta_key='avatar'
  AND meta_key NOT LIKE '% '
  ORDER BY RAND()
  LIMIT 4
  </code></pre>
  
  <p>In that way, I want to try to get only field values, where no empty spaces re in the file name. Where is the error in my query? It still selects filenames with empty spaces in the filename.</p>