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I have created a MySQL database and created tables in it. Is there a way to enter data into it from a micro-controller and access it in my web app?

Yup. You can make an HTTP end-point that the microcontroller can post data to and then have your web app capture and store the data so it can show it.

BTW a good starting point would be to google for "Python REST" plus the web framework you're using (eg. "python REST django" or "python REST Flask"). REST APIs are a great way to build something you can send data to from lightweight systems like microcontrollers.