title: MySQL: select * from table where col IN (null, "") possible without OR
body: <p>Is it somehow possible to do a select for empty strings and NULL values in MySQL without using or?</p>
  <p>This:</p>
  <pre><code>   select * from table where col IN (null, &quot;&quot;);
  </code></pre>
  <p>doesn't work, it ignores the null (or possibly matches it with the string 'null').</p>