How can I restore a single column of a single MySQL table?

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http://serverfault.com – I have a database in which there is one table where one column has invalid data. I also have a backup of said database of a few days before. In that backup, that column still has the valid data. But other tables in that database are already incredibly outdated. So, a full rollback to that backup is not an option. Rather, I would like to only import that single, corrupted column from the backup into the current database. The live database has also accumulated a few new, valid rows in that table. Obviously, we would like those to be preserved. I can't think of a way that doesn't involve heav (HowTos)