Data bases don't have COLUMNS, spreadsheets do.
I assume you mean that a field was deleted from a table and all the data
that lives in that field went with it.
If you have a backup of the database, just copy the table from you rbackup
to the working file.
If you have added data since that backup, then you would want to add the
field back to the table in design-view, then use an update query to update
all the existing records with the missing data from the 'backup' table. The
records from after the backup would have to be manually corrected.
Post back if you need help building the update query.