TG napsal(a):
But what if the data being inserted isn't unique? What if it's a voting form that says "Do you like pie? Yes/No"? True, it could record the response and the userid or IP address so that would be a unique pairing but what if the vote was anonymous and you allowed multiple people from the same IP address (ie behind a firewall/proxy) to submit votes?
simple solution with timestamp - you allow to vote from 1 ip once in a given time (day, hour, minute, second, depends on you)
There could be cases where the data isn't necessarily unique
Sorry, I dont know any.

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