I have a site with horse racing results and the results table consists of:
Date, Time, Course, Horse, Odds, Result, Profit

I have about 6 months results in there and obviously there are no unique
fields.
Each morning I imprt a new spreadsheet with the days racing selections
without the odds and result field filled in. As the day goes on I use a page
to update the results but when I update a race with horse that has run in
the past it updates the new record and the old record as well. I now have 2
identical records as the data updates has overwritten the old record for the
horses race before.

Any ideas!?!?!?!?
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