Get elements from database based on distance from a point
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Im pretty new to backend web design, but I am building a webapp and will have a database of locations. As the database gets big, I realized that if I want people to be able to access the database and say, for example, see points around them, it would take a long time to go through every element and check the distance from them to any given point.

Does anyone know of a way to quickly check the database, but maybe only relevant locations?

Im using python, django, and SQL if that makes any difference.