Update statement using self join - forum topic by arbiswas

Hi Experts,
I hava an employee table which effective date and post effective date. post_eff_dt is next eff_dt for that employee.
So if 31-jan-2013 is first row and 28-feb-2013 is second row then row should look like this
EMP    EFFDT          POST_EFFDT
27227    31-jan-2013  28-feb-2013
27227    28-feb-2013  2999-12-31 (High date for latest record)
Now if same effdt has multiple rows, then I am facing problem.
My data is looking like (set A)
27227  1/3/2012   1/3/2012
27227  1/3/2012   31/12/2999
27227 1/10/2011  1/10/2011
27227 1/10/2011  1/3/2012
27227 1/1/2007    1/10/2011
27227 1/1/2007    1/1/2007
27227 21/09/2006 1/1/2007
27227 21/09/2006 21/09/2006
and it should be, (SET B)
27227 1/3/2012     31/12/2999
27227 1/3/2012     31/12/2999
27227 1/10/2011    1/3/2012
27227 1/10/2011    1/3/2012
27227 1/1/2007     1/10/2011
27227 1/1/2007     1/10/2011
27227 21/09/2006  1/1/2007
27227 21/09/2006  1/1/2007
Can you pls provide the update statement to get SET B from SET A.
 
Thanks in advance,