title: Oracle showing only "PL/SQL procedure successfully completed". No output after running the code
body: <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>