PostgreSQL is a fully open-source relational database known for strict adherence to SQL standards and a long history of adding advanced, sometimes cutting-edge features ahead of many other RDBMS products.
Core Concept
PostgreSQL traces its roots to the POSTGRES research project at the University of California, Berkeley, in the 1980s, and has been continuously developed as open-source software since. It's often chosen specifically for its strong standards compliance, extensibility, and advanced features like support for custom data types.
Deep Dive
- PostgreSQL has no single commercial owner — it's developed by an open community, which is part of why it has no separate paid "enterprise edition" the way MySQL does.
- It's commonly favored for applications with complex data requirements, precisely because of how closely and rigorously it implements the SQL standard and how many advanced capabilities it supports beyond the baseline relational model.
Production Perspective
PostgreSQL has grown significantly in popularity over the last decade, and is now a common default choice for new projects that want strong standards compliance without being tied to a single commercial vendor.
Interview Questions
Why might a team choose PostgreSQL specifically over MySQL for a new project?
Often for its stricter standards compliance and broader set of advanced built-in features — though for many common workloads either would work fine, and the choice comes down to team familiarity and specific feature needs.