What is the difference between SQL and NoSQL databases?

SQL vs NoSQL - key differences:

SQL Databases

Organized in tables with predefined schemas. Data related through foreign keys. Examples: MySQL, PostgreSQL. Best for complex queries and transactions.

NoSQL Databases

Flexible schemas for unstructured data. Designed for horizontal scaling. Examples: MongoDB, Redis. Best for big data and real-time apps.

Key Differences

• Schema: SQL rigid, NoSQL flexible
• Scaling: SQL vertical, NoSQL horizontal
• ACID: SQL compliant, NoSQL often sacrifices for performance

When to Choose?

SQL for complex queries and data integrity. NoSQL for flexibility and high performance at scale.

I am confused about when to use SQL databases versus NoSQL databases. Can someone explain the key differences, advantages, and use cases for each type?