SQL Practice: Intermediate Queries Course
Level up your SQL with hands-on practice in joins, subqueries, window functions, indexing, and schema design. Build realistic datasets, tune query performance, and write production-ready SQL for real technology products.

flexible workload of 4 to 360h
valid certificate in your country
What will I learn?
Strengthen your SQL skills with focused, hands-on practice using a realistic online learning platform schema. You will design normalized tables, generate sample data, and write intermediate queries with joins, aggregates, subqueries, and window functions. Learn to handle nulls, apply conditional logic, tune performance with indexes, read EXPLAIN plans, and deliver a clean, well-documented SQL project ready for real-world use.
Elevify advantages
Develop skills
- Design relational schemas: model users, courses, and events for analytics.
- Write intermediate SQL: joins, subqueries, and window functions on real data.
- Optimize SQL performance: add indexes, read EXPLAIN, and tune slow queries.
- Handle nulls and dates: robust CASE logic, safe division, and cohort metrics.
- Generate and document seed data: realistic test sets for fast SQL iteration.
Suggested summary
Before starting, you can change the chapters and the workload. Choose which chapter to start with. Add or remove chapters. Increase or decrease the course workloadWhat our students say
Your classes are perfect. I purchased the one-year package and finally have the opportunity to follow various topics of my interest without needing to change platforms... I thank you for everything you do, I've already recommended you to other people...

Giulio CarloDigital Marketing Student
I like how the lessons are straight to the point and how I can switch chapters and skip content I don't need.

Mariana FerresPhotography Student
I like the content and the way videos are presented and transcribed, which speeds up the process!

Luciana AlvarengaNail Design Student
The platform is fast, simple to use. The diversity of content and complementary videos really help with learning.

André FelipePrompt Engineering Student
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