Last updated November 17, 2008. Created by aufumy on November 17, 2008.
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Create a mapping table to record the drupal nid to the unique id found on the old database. The purpose is to have a way of tracking the work done, and to have a way of double checking.

Also, it is used to know what data has already been inserted, and what new data has not yet been inserted.

* the minimum columns in a mapping table would be
** id : just the usual unique id for a table
** nid: node nid created in drupal
** label_id: unique id on the old database
** other columns can be created as needed, for quick reference and checking.

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