MySQL and PostgreSQL are the two most popular open source relational databases. Both are mature, ACID compliant, free to use, and power huge numbers of production applications. They overlap heavily, so the decision is rarely about one being clearly better and more about which style fits your project.
MySQL built its reputation as the fast, simple database at the heart of the classic LAMP stack, and it is now owned by Oracle. PostgreSQL is community owned and prized for standards compliance, an advanced feature set and deep extensibility. This comparison breaks down licensing, features, extensibility and JSON so you can see where each one leads.
Side by side
| Aspect | MySQL | PostgreSQL |
|---|---|---|
| License | Open source (GPL) with a commercial license from Oracle | Open source under the permissive PostgreSQL License |
| Ownership | Owned by Oracle | Community owned, no single vendor |
| Reputation | Simple, fast, great for reads and web (LAMP) | Standards compliant, advanced and extensible |
| SQL features | Solid core SQL, has added CTEs and window functions | Richer: CTEs, window functions, advanced types |
| Extensibility | Pluggable storage engines (InnoDB and others) | Extensions such as PostGIS, custom types and functions |
| JSON support | JSON type with good functions | Rich native jsonb type with powerful indexing |
| Replication | Mature, easy to set up async and semi sync replication | Strong streaming and logical replication |
| Best known for | Web apps, simplicity and fast reads | Complex queries, data integrity and extensibility |
Where each one leads
MySQL strengths
- Simple to install, learn and operate for common web workloads
- Very fast for read heavy and straightforward query patterns
- Huge ecosystem, hosting support and the classic LAMP heritage
- Pluggable storage engines and easy replication setup
PostgreSQL strengths
- Permissive open source license with no single vendor owner
- Excellent standards compliance and advanced SQL support
- Powerful extension ecosystem including PostGIS for geospatial
- Rich data types and a native jsonb type with strong indexing
When to choose each
Choose MySQL if
- You are building a typical web app or a LAMP style stack
- You want a simple, fast database that is easy to host anywhere
- Your workload is read heavy with straightforward queries
- Your team already knows MySQL or MariaDB
Choose PostgreSQL if
- You need advanced SQL like rich window functions and CTEs
- You want strong data integrity and standards compliance
- You rely on extensions, custom types or geospatial (PostGIS)
- You work with heavy JSON and want native jsonb indexing
Verdict
There is no forced winner here. Choose MySQL when you want a simple, fast and familiar database for web applications and read heavy workloads, especially on a LAMP style stack. Choose PostgreSQL when you value standards compliance, advanced SQL, rich data types and extensibility. Both are free, open source and run demanding production workloads well, so feature needs and team skills usually decide it.
Frequently asked questions
Is MySQL or PostgreSQL better?
Neither is universally better. MySQL leans toward simplicity and fast reads for web workloads, while PostgreSQL leans toward advanced features, data integrity and extensibility. The best choice depends on your feature requirements and what your team knows.
Are both MySQL and PostgreSQL free?
Yes. Both are free and open source. MySQL is owned by Oracle and offered under the GPL with a paid commercial license option, while PostgreSQL uses the permissive PostgreSQL License with no single vendor. If you like open source MySQL, also see the MariaDB vs MySQL comparison.
Which has better JSON support?
Both support JSON well. MySQL has a JSON type with a good set of functions, while PostgreSQL offers a native jsonb type with powerful indexing that is often preferred for heavy JSON workloads.