What are the main differences between SQL and NoSQL databases?
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SQL databases are relational databases that use structured query language (SQL) for defining and manipulating data. They are designed for structured data with predefined schemas and support complex queries and transactions. Examples include MySQL and PostgreSQL.
NoSQL databases, on the other hand, are designed for unstructured or semi-structured data and offer flexible schemas. They are often used for applications requiring high scalability and performance, such as big data and real-time web apps. NoSQL databases include various types such as document stores (MongoDB), key-value stores (Redis), and column-family stores (Cassandra).