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The SQL Mastery Certificate: Final Project

Senior Data Analyst
April 10, 2026
10 min read

Congratulations!

You have completed 100 Days of SQL Mastery. You've gone from your first SELECT to advanced optimization, from basic WHERE clauses to recursive CTEs and window functions.

The Final Challenge

Build a complete analytical solution:

1. **Schema Design**: Create tables for an e-commerce system.

2. **Data Loading**: Insert sample data.

3. **Reporting**: Write CTEs and Window Functions to calculate:

  • Monthly Active Users.
  • Customer Lifetime Value.
  • Top products by revenue.

    • 4. **Optimization**: Add indexes and explain your choices.

    5. **Documentation**: Use `information_schema` to generate a data dictionary.

    What's Next?

    You are no longer a beginner. You are ready for:

  • **Data Science**: Days 101-150 cover Python, Pandas, and Machine Learning.
  • **Data Engineering**: Learn dbt, Airflow, and ETL pipelines.
  • **Leadership**: Become the go-to expert on your team.

    • Thank you for learning with SQL Mastery. Now go build something amazing.

    Ready to put your knowledge into practice?

    Join SQL Mastery and learn through interactive exercises.