SQL Course Review

You've now practiced SQL across different industries—retail, logistics, healthcare, and entertainment—each with its own data patterns and reporting needs.

This lesson is a review checkpoint, focused on how those skills come together when solving real problems.

The goal isn't to teach new syntax, but to reflect on how and when you've applied key SQL tools effectively.

Look back at the problems you've solved and consider:

• Which queries required multiple filters, joins, or nested logic?
• Where did using GROUP BY help you uncover patterns?
• How did LEFT JOIN or CASE help surface meaningful differences?

This kind of reflection builds stronger habits and prepares you for real-world analytics.

Real analysts don't just write working queries; they write queries that reveal insight and scale well.

Across the course, you've applied:

• WHERE, JOIN, GROUP BY, and HAVING in different combinations
• Subqueries for filtering and comparison
• Conditional logic to split and summarize data
• Techniques for fixing broken logic and debugging

These aren't just exercises; they form the foundation of most analytics workflows.