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Article:
  Upgrading a MySQL Application
Subject:   Version check
Date:   2003-10-18 01:15:55
From:   anonymous2
I think you shoud have an "app_version" or "table_version" field somewhere in the database, so you can be sure you're not updating an already up-to-date application. Updating a table more than once could be dangerous for the data and for the backup.