Let's solve a challenge with SQL

Challenge:

Categorize the scores [25, 75, 90, -5] into 'Low' (≤ 50), 'Medium' (≤ 80), 'High' (> 80), or 'Invalid' (< 0) using SQL.

Why solving challenges is the best way to learn?

Solving SQL challenges is the best way to learn because it moves you from passive knowledge to active application.

This process solidifies your understanding and builds the critical thinking skills needed for data analysis.

When you solve a problem, your brain actively processes information rather than passively consuming it. This active engagement leads to better retention.