Difference between "IS NOT NULL" and "NOT (field = NULL)" in these 2 queries
<p>What is the difference between the following 2 queries?</p>

<pre><code>DELETE FROM experience WHERE end IS NOT NULL;
</code></pre>

<p>And</p>

<pre><code>DELETE FROM experience WHERE NOT( end=NULL);
</code></pre>

<p>First query was accepted as a correct answer but second was not.</p>