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Appendix C. Upgrading from previous versions of BugZilla
-[This section under construction].
+The developers of BugZilla are constantly adding new tables, columns and fields.
+You'll get SQL errors if you just update the code. The strategy to update is
+to read the CHANGES file backwards, and apply all of the instructions given,
+typically things like:
+
+ ./makeattachmenttable.sh
+ ./makegroupstable.sh
+ alter table products add column disallownew tinyint not null;
+
+Someday someone should write a script that queries the existing database
+for all the required columns, and if any are missing, adds them.
Appendix D. History