System Tables Views Oracle PLSQL

SQL> --
SQL> SELECT JOB,WHAT,LAST_SEC,INTERVAL from USER_JOBS;
       JOB
----------
WHAT
--------------------------------------------------
LAST_SEC
--------
INTERVAL
--------------------------------------------------
        21
HELLO;
18:12:52
SYSDATE + (1/(24*60*60))
        22
HELLO;
18:12:52
SYSDATE + (1/(24*60*60))
        41
HELLO;
SYSDATE + (1/(24*60*60))
        42
HELLO;
SYSDATE + (1/(24*60*60))
4 rows selected.
SQL>
SQL> --