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In an earlier article, we introduced you to Presto, an open-source, distributed SQL query engine. It lets you use SQL to query data from many types of storage solutions. This includes data sources that don’t support SQL natively; for example, a JSON file stored on AWS S3. What’s even more interesting, is that Presto lets you perform joins across multiple databases based on different technologies. In our view, Presto is a great tool for organizations that store their data in multiple data sources, and want to analyze this data without…

It is not uncommon for companies to use multiple data stores based on different technologies. We can easily imagine an organization using relational databases for transactional data, a NoSQL database such as MongoDB for semi-structured data, and an S3 bucket for large datasets. When performing analytical tasks, we often need to combine data from all of these sources. Traditionally, this meant gathering everything in one place: a data warehouse or a data lake. This brings a lot of issues; movement of data takes time, and we also need to perform…