title: What does 'XXXXXX' mean as the second argument to TO_NUMBER? Oracle SQL
body: <pre><code>CREATE OR REPLACE TRIGGER fund_BIU   
  BEFORE INSERT OR UPDATE ON fund  
  FOR EACH ROW   
  BEGIN
  IF INSERTING AND :new.fundid IS NULL THEN   
      :new.fundid := TO_NUMBER(SYS_GUID(), 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');   
      END IF;   
  END;
  /  
  </code></pre>
  
  <p>I'm interested the <code>IF</code> statement. What does it mean 
  <code>:new.fundid := to_number(sys_guid(),'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');</code>. To be precise <code>sys_guid(), 'xxxxxxxx'</code> part. </p>
  
  <p>TY</p>