Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In computing, NoSQL is a broad class of database management systems that differ from the classic model of the relational database management system in some significant ways, most important being they do not use SQL as their primary query language. These data stores may not require fixed table schemas, usually do not support join operations, may not give full ACID guarantees, and typically scale horizontally. Academic researchers typically refer to these databases as structured storage, a term that includes classic relational databases as a subset. Often, NoSQL databases are categorized according to the way they store the data and fall under categories such as key-value stores, BigTable implementations, document store databases, and graph databases.

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