This is not a homework assignment. :)
I'm a MySQL newbie and we just bought a product that uses it. The vendor has indicated that what I want is a special request and wants to schedule professional services time (several weeks in the future) to write us a personalized script. It's affecting production, so I need to get something worked out sooner than that.
Situation: All changes made through the GUI are logged in a table auditlog. One type of activity is causing the table to fill up, preventing users from logging in. We did some selective pruning of the information (which is not an option through the vendor-supplied tools) and were able to get it back up and running. Shortly after I went on vacation for the holidays, another error appeared and a coworker truncated the auditlog.
It's much too late to roll back to that version of the database, but I am able to pull out the pieces of the auditlog that we would like to merge with what's been created since the table was truncated. I've installed MySQL on my machine, imported the backup copy, and cleaned up the table to just what we want to keep permanently.
Local machine - auditlog contains historical records
Production machine - auditlog contains recent records
Issue: I can't do a straight import because the primary keys will have duplicates.
Question: How do I merge the information from the active auditlog and the records from the backup we want to keep?