SQL Course
Master SQL for subscription billing systems. Design schemas, tune indexes, manage data safely, and write analytical queries for MRR, churn, and overdue invoices—practical skills for engineers, data analysts, and tech leads.

flexible workload from 4 to 360h
valid certificate in your country
What will I learn?
This SQL Course teaches you how to design and optimize relational schemas for subscription billing, configure major database engines, and implement robust constraints for accurate monetary data. Learn to populate realistic test data, run analytical queries for recurring revenue and overdue invoices, and maintain performance with indexing, safe migrations, and cleanup strategies in a concise, practical format.
Elevify advantages
Develop skills
- Design robust billing schemas: model subscriptions, invoices, and payments fast.
- Optimize SQL performance: build smart indexes and read explain plans with ease.
- Enforce data integrity: apply keys, constraints, and safe cascade delete rules.
- Generate realistic test data: seed subscription, invoice, and payment scenarios quickly.
- Build analytical SQL reports: MRR, churn, overdue invoices, and top-paying customers.
Suggested summary
Before starting, you can change the chapters and workload. Choose which chapter to start with. Add or remove chapters. Increase or decrease the course workload.What our students say
Your classes are perfect. I purchased the one-year package and finally have the chance to follow several topics I'm interested in without needing to switch platforms... I appreciate everything you do, I've already recommended you to others...

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 the videos are presented and transcribed, which speeds up the process!

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 CarloPrompt Engineering Student
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