NoSQL (Not Only SQL) are non-relational databases that store data in a non-tabular format. They are designed to handle large amounts of data and to be highly scalable.
Non-relational
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NoSQL databases never follow the relational model
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Never provide tables with flat fixed-column records
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No complex features like query languages, query planners, referential integrity joins, ACID
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Offers easy to use interfaces for storage and querying data provided\
These are several types of SQL databases, and its examples:

