Please let me know how I can add a new column with a constraint not null, table already has data, without falling off the table... Please help me on this issue...

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  I have tab_trans of transactions table which has nearly 20 million records.
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  Trans_id     Trans_date     Ref_trans_id     Ref_trans_date     Trans_amount         Trans_ind        
  10000     2/2/2010 13:12:10                                   100                      0        
  10001     8/2/2010 12:43:55                                   300                      0        
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  10001     8/2/2010 12:43:55                                      300                    0         0
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