Query Course
Master SQL for real-world tech systems with Query Course. Design schemas, write safe updates, build powerful reports, and tune indexes using an online learning platform case study to drive accurate analytics and reliable data operations.

flexible workload from 4 to 360h
valid certificate in your country
What will I learn?
Query Course teaches you to design robust schemas, write precise SQL, and build reliable reporting for real-world learning platforms. You will master joins, aggregations, window functions, subqueries, and date filters, then optimize performance with indexing, EXPLAIN plans, and materialized views. The course also covers safe updates, deletes, transactions, and clean, review-ready SQL deliverables for data-intensive systems.
Elevify advantages
Develop skills
- Safe SQL updates and deletes: protect production data in real-world systems.
- Reporting queries for tech products: build leaderboards, revenue and usage views.
- Relational schema design: model users, courses, payments and progress cleanly.
- SQL performance tuning: design indexes and read patterns for fast analytics.
- Production-ready SQL deliverables: clean DDL, sample data and reviewable queries.
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
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