SQL and NoSQL are two broad classes of database technologies, distinguished by how they structure, query, and store data.
- Use SQL when data integrity, relational logic, and transactional consistency are key.
- Use NoSQL when scalability, performance, and schema flexibility are priorities.
| Feature | SQL | NoSQL |
|---|---|---|
| Data model | Relational (tables, rows) | Varies (documents, key-value, graph) |
| Schema | Fixed / predefined | Flexible / dynamic |
| Query Language | SQL | Varies (JSON queries, APIs, etc.) |
| Transactions | ACID | Often BASE (eventual consistency) |
| Scalability | Vertical (scale-up) | Horizontal (scale-out) |
| Best for | Structured data, complex queries | Unstructured data, high throughput |
Related: