PL/SQL :: SQL To Find Out Changes?

I have a table with 50 columns, lets call it Table_A . There is a identical table called Table_B. The data in Table_B gets flushed every night and data from Table_A is moved to Table_B. A new set of data is inserted into Table_A. Now I need to find out which field value is changed and what is changed . A minus command can give the changed records, but how to get the what was prior value for each changed field . Here is what I am looking for

WITH TABLE_A AS  (  SELECT 1 ID, 'JOHN' NAME,  'SALES' DIV FROM DUAL
UNION
        SELECT 2 ID, 'MARRY' NAME,  'ACCOUNTS' DIV FROM DUAL
UNION
        SELECT 3 ID, 'KIM' NAME,  'SERVICE' DIV FROM DUAL),

[code]...

what i want is something that will spit out this (only one record, because there is only one diff record found in the above query.)

ID,     OLD_ID,     NAME,   OLD_NAME ,  DIV ,       OLD_DIV
--      ------      ----    --------    ---         -------
3           3       KIM       KIM       SERVICE     SALESThe above one is for sample purpose, The actual table has 50 fields, and except the ID field, all other field values might change.