title: Oracle STANDARD_HASH not available in PLSQL?
body: <p>I'm trying to use STANDARD_HASH Oracle (12c) function in PL/SQL but seems not available:</p>
  
  <pre><code>SQL&gt; exec   dbms_output.put_line(STANDARD_HASH('test'));
  BEGIN dbms_output.put_line(STANDARD_HASH('test')); END;
  
                             *
  ERROR at line 1:
  ORA-06550: line 1, column 28:
  PLS-00201: identifier 'STANDARD_HASH' must be declared
  ORA-06550: line 1, column 7:
  PL/SQL: Statement ignored
  </code></pre>
  
  <p>From sql is working just fine:</p>
  
  <pre><code>SQL&gt; select STANDARD_HASH('test') from dual;
  
  STANDARD_HASH('TEST')
  ----------------------------------------
  A94A8FE5CCB19BA61C4C0873D391E987982FBBD3
  </code></pre>
  
  <p>Why? What is the best way to implement the STANDARD_HASH in PLSQL?</p>
  
  <p>Regards</p>