5 Advanced SQL queries every Data Engineer & Scientist should know!

Over the years, I’ve worked on dozens of data engineering projects and these 5 advanced SQL queries have queries have gotten me out of few jams! Hope you find them useful 1. Using the SQL APPLY Operator Ever find yourself trying to find the last transaction, a set of customers made? Struggled with trying to

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Querying PostgreSQL with AWS Athena

Amazon Athena make it easy to analyze semi-structured and non-structured data like json, xml etc. directly in Amazon S3 using SQL. However, it also allows you to easily query a number of relational databases hosted in AWS such as mySQL and PostgreSQL. For any Data Scientist, this opens up a world of potential because now it’s possible to write SQL queries that combine data from both relational and non-relational data source in a single query!

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