What Is the Difference Between SQL and NoSQL Databases

Short answer

SQL databases use structured tables with predefined schemas and support ACID transactions. NoSQL databases use flexible formats like documents or key-value pairs and prioritize scalability.

Key differences

• Schema: SQL requires rigid schemas; NoSQL is schema-flexible.
• Scaling: SQL scales vertically; NoSQL scales horizontally.
• Query language: SQL uses standardized queries; NoSQL uses proprietary APIs.
• Consistency: SQL emphasizes strong consistency; NoSQL often uses eventual consistency.

When to use each

• Use SQL for complex relationships, financial data, and reporting.
• Use NoSQL for rapid iteration, big data, and distributed systems.