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Answers
It looks like you can only hide identical columns from the data difference viewer, but the CSV report still includes everything.
Can you kindly post your suggestion on our user voice forum so that other people can vote for it?
https://redgate.uservoice.com/forums/147879-sql-data-compare
Tianjiao Li | Redgate Software
Have you visited our Help Center?
I have added to the user voice forum here:
https://redgate.uservoice.com/forums/147879-sql-data-compare/suggestions/35726938-exporting-only-mismatch-fields-to-csv