title: Liquibase change existing nullable constraint from true to false
body: <p>I added a column to an existing table using <code>Liquibase</code> changelog, and I set the nullable constraint to true.</p>
  <p>Code:</p>
  <pre class="lang-xml prettyprint-override"><code>&lt;changeSet id=&quot;10&quot; author=&quot;000000&quot;&gt;
      &lt;addColumn tableName=&quot;NCV_ATTRIBUTE&quot;&gt;
          &lt;column name=&quot;AlternativeListPrice&quot; type=&quot;double&quot; defaultValue=&quot;0.0&quot;&gt;
          &lt;constraints nullable=&quot;true&quot;/&gt;
          &lt;/column&gt;
      &lt;/addColumn&gt;
  &lt;/changeSet&gt;
  </code></pre>
  <p>I want to change the nullable constraint from true to false in changeSet 11.  What is the simplest way to achieve this?</p>
  <p>Thanks.</p>