Identifying Changed Columns
In addition to information about which rows were changed and the operation that caused the change (insert, update, or delete—reported as I, U, or D in the SYS_CHANGE_OPERATION), the CHANGETABLE(CHANGES ...) function also provides information on which columns were modified if you enabled the TRACK_COLUMNS_UPDATED option. You can use this information to determine whether any action is needed in your client application based on which columns changed.
To identify whether a specific column has changed, you can use the CHANGE_TRACKING_IS_COLUMN_IN_MASK (column_id, change_columns) function. This function interprets the SYS_CHANGE_COLUMNS bitmap value returned by the CHANGETABLE(CHANGES ...) function and returns a 1 if the ...
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