title: Postgis – Opposite of ST_Within
body: <p>I'm trying to get all points that are NOT inside a few polygons:</p>
  
  <pre><code>SELECT pt.geom 
  FROM points pt, polygons po
  WHERE ST_Within(pt.geom, po.geom) = false;
  </code></pre>
  
  <p>But doesn't work – I get all the points instead.</p>