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Are NoSQL databases relevant for data engineering? We'll investigate use cases for which data engineers may need to interact with NoSQL data stores. Data is stored at such a velocity, volume, and variety (in short: Big Data) that many relational database systems can’t keep up. With the velocity of data, continuously streaming in real-time, many No. No.SQL databases help address that issue. Data engineers need to be able to integrate and consolidate data from various sources and provide it to data consumers.