SQL Joins and Subqueries Course
This course teaches advanced SQL techniques for efficient data querying and analysis, covering joins, subqueries, CTEs, window functions, performance tuning, and best practices for writing production-ready SQL.

4 to 360 hours flexible workload
valid certificate in your country
What will I learn?
Master SQL joins, subqueries, and CTEs to write fast, reliable reporting queries in this focused course. You will learn advanced join types, anti-join patterns, window functions, and Top-N ranking, plus indexing and EXPLAIN ANALYZE for performance tuning. Practice time-based filtering, date arithmetic, and timezone handling while building clear, reusable SQL for accurate, production-ready analytics.
Elevify advantages
Develop skills
- High-performance joins: Tune indexes, plans, and timeouts for fast SQL reporting.
- Advanced subqueries and CTEs: Build clear, reusable logic for complex analytics.
- Window functions and Top-N: Rank, segment, and aggregate large datasets with ease.
- Time-based filtering mastery: Write accurate, timezone-aware date and event queries.
- Clean, maintainable SQL: Enforce naming, validation, and documentation best practices.
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.

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