title: How do I change column default value in PostgreSQL?
body: <p>How do I change column default value in PostgreSQL?</p>
  
  <p>I've tried: </p>
  
  <pre><code>ALTER TABLE ONLY users ALTER COLUMN lang DEFAULT 'en_GB';
  </code></pre>
  
  <p>But it gave me an error:</p>
  
  <pre><code>ERROR: syntax error at or near "DEFAULT"
  </code></pre>