MIN and MAX for extremes

Concepts covered: sqlMinMax

Basic MIN/MAX Usage Finding Extremes Within each category, the smallest price is selected. Electronics keeps 149 (ignoring 299 and 599), while Clothing keeps 29. This tells you the price range within each category. Electronics spans $450 while Clothing only spans $60. Advanced Applications MIN/MAX with Dates Now you can see each customer's entire order history at a glance: when they first ordered, their most recent order, and how many orders they have placed. MIN/MAX with Text Combining Aggregates This comprehensive summary shows price distribution across categories: how many products, the cheapest, average, and most expensive in each. Database Execution

About This Interactive Section

This section is part of the Aggregating: Beginner lesson on DataDriven, a free data engineering interview prep platform. Each section includes explanations, worked examples, and hands-on code challenges that execute in real time. SQL queries run against a live PostgreSQL database. Python runs in a sandboxed Docker container. Data modeling problems validate against interactive schema canvases. All content is framed around what data engineering interviewers actually test at companies like Meta, Google, Amazon, Netflix, Stripe, and Databricks.

How DataDriven Lessons Work

DataDriven combines four interview rounds (SQL, Python, Data Modeling, Pipeline Architecture) with adaptive difficulty and spaced repetition. Easy problems get harder as you improve. Weak concepts resurface until you master them. Your readiness score tracks progress across every topic interviewers test. Every lesson section ends with problems you solve by writing and running real code, not by picking multiple-choice answers.