SQL Course Review

You’ve practiced SQL across multiple industries — retail, logistics, healthcare, and entertainment — each with unique data patterns and reporting challenges.

This lesson serves as a checkpoint, helping you reflect on how those skills connect to real-world problem-solving.

The goal here isn’t to introduce new syntax, but to strengthen your understanding of when and why to use each SQL tool.

Reflect on the problems you’ve solved and ask yourself:

• Which queries combined multiple filters, joins, or nested logic?
• Where did GROUP BY help uncover trends or categories?
• How did LEFT JOIN or CASE expose key differences or insights?

Taking time to reflect like this strengthens your analytical habits and prepares you for real-world data challenges.

Great analysts don’t just write queries that work — they write queries that reveal insight and scale efficiently.

Throughout this course, you’ve applied:

• WHERE, JOIN, GROUP BY, and HAVING in different contexts
• Subqueries to compare, filter, or calculate within larger queries
• Conditional logic to classify or summarize results

Debugging and troubleshooting techniques for query accuracy

These skills go beyond exercises — they form the core foundation of modern analytics and data-driven decision-making.