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  1. or download this
    SELECT * FROM Table WHERE NOT EXISTS (SELECT * FROM BackupTable WHERE Table.Key = BackupTable.Key)
  2. or download this
    SELECT Key FROM Table LEFT JOIN BackupTable ON Table.Key = BackupTable
+.Key WHERE Table.column1 <> BackupTable.column1 OR Table.column2 <> B
+ackupTable.column2 ......