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SQL Practice: Intermediate Queries Course

SQL Practice: Intermediate Queries Course
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.
Workload: between 4 and 360 hours

What our students say

Your lessons are perfect. I purchased the one-year package and finally have the chance to follow several topics I'm interested in without having to switch platforms... thank you for everything you do, I've already recommended you to others...
Giulio Carlo
Giulio CarloDigital Marketing Student
I like how the lessons get straight to the point and how I can switch chapters and skip content I don't need.
Mariana Ferres
Mariana FerresPhotography Student
I like the content and the way the videos are presented and transcribed, which speeds up the process!
Luciana Alvarenga
Luciana AlvarengaNail Design Student
The platform is fast and easy to use. The variety of content and the supplementary videos really help with learning.
Giulio Carlo
Giulio CarloPrompt Engineering Student

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