Working with PostgreSQL and MySQL in Node.js

What changes when the users live in a relational database instead of MongoDB? The four operations stay the same, but there is no schema library in between. Your code writes SQL statements, sends them through a driver, and receives rows back. This lesson stores the same users in PostgreSQL with the pg package, and in MySQL with the mysql2 package.

PostgreSQL and MySQL are both open-source relational databases, and both are widely used with Node.js. PostgreSQL follows the SQL standard closely and has many advanced features, such as JSON columns and its own extensions