Build a Priority-Based Hierarchy in SQL. Common Interview Question - Full breakdown. скачать в хорошем качестве

Build a Priority-Based Hierarchy in SQL. Common Interview Question - Full breakdown.

🎯 Selecting entries based on hierarchy or priority of rules is one of the most common tasks asked in the interview and the one you will likely face during your day-to-day job as a Data Engineer, Data Analyst, or Software Engineer. In fact, I got the idea to record this video while solving a problem at work. In that video, we will walk through two practical examples of how to apply the hierarchy and priority of rules to a set of rows and get: Top 3 reviews per product the best email object Also, I briefly touch SQL window functions, because they are the main tool that will help us solve these problems, specifically ROW_NUMBER(). Whether you’re preparing for interviews or just sharpening your day-to-day SQL, this is one of those patterns you’ll want to have in your toolbox. TIMESTAMPS 0:00 Intro 0:36 Problem 1: Select the top 3 relevant reviews per product 8:07 Problem 2: Deduplication of emails 21:27 Conclusion Source code from the video: https://github.com/eukosh/jad-example... ========= Hi friend, my name is Eugene and I'm just a dev 👨🏼‍💻 I've been in tech for 5 years, working as a Data Engineer 📊 Join me on this journey, and let’s build an honest, open, supportive, authentic dev community of learners and builders.