When deciding between MongoDB and PostgreSQL, the biggest difference is how the data is organized.

PostgreSQL is a strong choice when the data is structured and works well in related tables. MongoDB is often more suitable when the data is flexible, nested, or expected to evolve.

Both databases are great, but they approach the same data in different ways.

To make that easier to understand, the same clinic data is shown below in two forms: once as MongoDB documents and once as PostgreSQL tables.

The same clinic data was modeled as a MongoDB document and a PostgreSQL relational schema.

What Makes Them Different: Tables vs Documents

This picture illustrates how the same data about '' clinic visits '' looks in two database systems.…