TITLE                           PUBDATE                   SYSDATE            AGE                    
BODYBUILD IN 10 MINUTES A DAY  | 21-JAN-01 00:00:00 | 14-NOV-12 13:16:35 | 141  
REVENGE OF MICKEY              | 14-DEC-01 00:00:00 | 14-NOV-12 13:16:35 | 131  
BUILDING A CAR WITH TOOTHPICKS | 18-MAR-02 00:00:00 | 14-NOV-12 13:16:35 | 127    
DATABASE IMPLEMENTATION        | 04-JUN-99 00:00:00 | 14-NOV-12 13:16:35 | 161 
COOKING WITH MUSHROOMS         | 28-FEB-00 00:00:00 | 14-NOV-12 13:16:35 | 152 
HOLY GRAIL OF ORACLE           | 31-DEC-01 00:00:00 | 14-NOV-12 13:16:35 | 130 

14 rows selected
	
SELECT title, TO_CHAR(ROUND(pubdate), 'DD-MON-YY HH24:MM:SS') AS pubdate,
  TO_CHAR(SYSDATE, 'DD-MON-YY HH24:MM:SS') AS "SYSDATE", 
  ROUND(SYSDATE - TO_DATE(pubdate)) AS age
FROM books;
	
SELECT title, 
       TO_CHAR(ROUND(pubdate), 'DD-MON-YY HH24:MM:SS') AS pubdate, 
       TO_CHAR(SYSDATE, 'DD-MON-YY HH24:MM:SS') AS "SYSDATE", 
       trunc( months_between( sysdate, pubdate )) AS age 
  FROM books;