How to block duplicity in database

Hello guys it’s me I’m needing help with this question my boss was evaluating my system that I’m building, he found a problem, My system gives for the user possibility of register the same iformation how much times wish, there’s some way to block duplicity in database?

Yes, for example, if you’re not wanting the same user with a company ID or something prior to registering a new user you can add a condition to: Do a search for a user with the constraints of the ID not equaling the ID input.

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