Oracle showing only "PL/SQL procedure successfully completed". No output after running the code
<p>This is what it is showing. No output even after running the code block</p>

<pre><code>    SQL&gt; DECLARE
    2     message  varchar2(20):= 'Hello, World!';
    3  BEGIN
    4     dbms_output.put_line(message);
    5  END;
    6  /

    PL/SQL procedure successfully completed.
</code></pre>