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I recently imported our student file to our database, but I mapped the CARD ID field incorrectly, now I've tried to correct these records by re-importing with the correct field, but some students (over 1000) are not in the import file (and I have no access to historical student lists) so they do not get updated. Is there a way to mass delete the CARD ID field from all students so that IF they are not present on the latest import file they would be left blank. I can do this individually, but with over 1000 student records this task may be too time consuming for us. Any advice is appreciated. Thanks!
