SQL Practice: Intermediate Queries Course
This course provides hands-on practice with intermediate SQL queries on a realistic online learning platform schema, covering schema design, data generation, query writing with advanced techniques, performance optimization, and project documentation.

4 to 360 hours flexible workload
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 normalised 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.
- Optimise 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 workload.What our students say
Your lessons are perfect. I purchased the one-year package and finally have the opportunity to follow various topics of interest without needing to change platforms... I'm grateful 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 change 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 and simple to use. The diversity of content and complementary videos really help with learning.

André FelipePrompt Engineering Student
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