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Message Posted: Wed, 29 Apr 2009 @ 21:30:44 GMT

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No need to have tablename.columnname for the column that needs to be updated, just columname alone will do.

     update table_A
     set
     column1 = case when  table_A.column2=table_B.column2
                                             and  table_A.column2=table_C.column2
                                                 and table_C.column3=table_D.column3
                                                 then (case when  table_B.column4 = '1'
                                                                  and table_C.column4 = '2
                                                                      then  'Y'
                                                             else  'N'
                                             end)
                                      end

Regards,

Rakesh Saxena

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