Add Hint on Learn Relational Databases by Building a Mario Database

Let’s add a hint on how to delete duplicate data if user accidentally inserted twice of the same.

Welcome back!

Feature requests can be done on the freeCodeCamp github repo as issues

freeCodeCamp/freeCodeCamp: freeCodeCamp.org’s open-source codebase and curriculum. Learn to code for free. (github.com)

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