URGENT SQL question!

Hi all,
I've been struggling with this for quite some time now...
Let us assume that I have a table "EMPLOYEE" consisting of the following columns and data ('DD/MM/YYYY'):
EMP_NAME START_DATE END_DATE
john 01/01/2003
mark 02/02/2003
peter 03/03/2003
sue 04/04/2003
The START_DATE for each employee has to be the END_DATE of the previous employee (except for the first record where the START_DATE will be that employee's corresponding END_DATE - 31.
This is how I want the table to look after the update:
EMP_NAME START_DATE END_DATE
john 01/12/2002 01/01/2003
mark 01/01/2003 02/02/2003
peter 02/02/2003 03/03/2003
sue 03/03/2003 04/04/2003
I'm TOTALLY stumped! What should I use? rownum, rowid or what?
Regards,
Johann.

Sorry, the first one is wrong!!!
UPDATE employee
SET start_date = (SELECT max(emp.end_date) FROM employee emp WHERE emp.end_date < employee.end_date);
UPDATE employee
SET start_date = end_date-31 where start_date is null;
DC

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