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Understanding NoSQL Databases

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What is NoSQL: NoSQL databases use non-relational data models instead of SQL
They are more flexible than relational databases
NoSQL can mean "Not only SQL" or work alongside SQL databases
Main Types: Columnar databases store data in columns without predefined keys
Document-oriented databases use documents as key-value stores
Graph databases store data through nodes and edges
Key-value databases use associative arrays with key-value pairs
Notable Examples: Columnar databases include Cassandra and Hadoop
Document-oriented databases include Couchbase and MongoDB
Graph databases include Neo4j and RedisGraph
Key-value databases include Redis and RocksDB
Additional Information: Blockchain is not a NoSQL database
NoSQL databases are used for specific purposes like ACID transactions
Many NoSQL systems exist for different data analysis needs