Engineering~8 min readComparison
Head to Head
PostgreSQL vs MySQL: correctness or simplicity?
PostgreSQLvsMySQL
Both are mature, free, battle-tested relational databases you can build a company on — so the choice rarely comes down to raw capability. The character differs: Postgres prizes correctness, standards-compliance and advanced features; MySQL prizes simplicity and fast, read-heavy operation. Knowing the grain of each keeps you from fighting your database later.
01
The core difference: character, not capability
PostgreSQL is the feature-rich, standards-first database: rich types (JSONB, arrays, ranges, geospatial), advanced indexing, powerful concurrency via MVCC, extensions, and strict correctness by default. MySQL is the simpler, extremely popular workhorse tuned historically for fast reads and straightforward web workloads, with a gentler learning curve and huge hosting ubiquity. Neither is "better" — they’re shaped differently.
→ The rule
Complex queries, data integrity, advanced types, or you’ll grow into heavy features? Postgres — increasingly the default for new projects. A simple, read-heavy app, or an ecosystem/host that favors it (much of classic PHP/WordPress-era web)? MySQL is perfectly solid.
| Dimension | PostgreSQL | MySQL |
|---|
| Philosophy | Correctness, standards, features | Simplicity, speed, ubiquity |
| Data types | Very rich (JSONB, arrays, geo, custom) | Solid core types; JSON support newer |
| Concurrency | MVCC, strong under mixed read/write | MVCC via InnoDB; historically read-tuned |
| Advanced SQL | Window fns, CTEs, full-text, extensions | Good; historically trailed on some features |
| Extensibility | Extensions (PostGIS, pgvector…) | Storage engines; fewer extensions |
| Ease of start | Slightly steeper | Very approachable |
| Ecosystem | Default for many modern stacks | Enormous, especially classic web hosting |
Note: MySQL and its fork MariaDB have closed much of the historical feature gap, and Postgres has always been fast — treat the old "MySQL is faster, Postgres has more features" shorthand as a rough tendency, not a law.
Reach for PostgreSQL
- Complex queries, analytics, reporting
- Rich data: JSONB, geospatial (PostGIS), vectors (pgvector)
- Strict data integrity and correctness
- You expect to grow into advanced features
- New greenfield project with no host constraint
Reach for MySQL
- Simple, read-heavy web applications
- Existing MySQL expertise or ecosystem (WordPress, LAMP)
- A host or platform that strongly favors it
- You value a gentle learning curve
- Straightforward CRUD without exotic types
→ The modern default
For new projects with a free choice, Postgres has become the common default — it does everything MySQL does, adds a deep well of features (including pgvector for AI retrieval), and you rarely outgrow it. Choose MySQL when the ecosystem, team expertise, or a specific host makes it the pragmatic pick.
Frequently asked
Quick answers
Is PostgreSQL better than MySQL?
Neither is universally better — both are excellent. Postgres leans toward correctness, advanced features and rich data types; MySQL toward simplicity and read-heavy speed with huge hosting ubiquity. For new projects with a free choice, Postgres is often the default because you rarely outgrow it.
Is MySQL faster than PostgreSQL?
Historically MySQL had an edge on simple read-heavy workloads and Postgres led on complex queries and mixed read/write, but the gap has narrowed enormously. In practice both are fast; performance depends on your schema, indexes and workload far more than the engine choice.
Should I use Postgres or MySQL for a new app?
Default to Postgres unless a specific reason points elsewhere — it handles rich types (JSONB, geo, vectors), complex queries and strict integrity, and scales further than most apps need. Choose MySQL when your ecosystem, team expertise, or host strongly favors it.
What about MariaDB?
MariaDB is a community fork of MySQL, largely compatible, created after MySQL’s acquisition by Oracle. It has added features and is a drop-in replacement in many cases. The Postgres-vs-MySQL trade-offs apply broadly to MariaDB as well.