SQL for Data Analysts and Interviews: Free Course

Ask real questions of real tables right in your browser, then walk into SQL interviews ready for the classics.

About this course

A free, hands-on SQL course where you write and run real queries in your browser from the first lesson. Start with SELECT, WHERE and ORDER BY, then GROUP BY and HAVING, every type of JOIN, subqueries, CTEs and window functions such as ROW_NUMBER, RANK and LAG. Every classic interview question is a named lesson: second highest salary, finding duplicates, top N per group, WHERE versus HAVING and employees with their managers. No MySQL install needed: the database runs right in the page, even on a phone.

Who it's for

Students, job seekers and working professionals moving into data, backend or analyst roles.

Why Techwave Academy

Techwave Academy is a free, hands-on learning platform built for Indian students K-12 and self-learners. Every course is interactive: code runs in your browser, AI mentors explain every concept, and progress is tracked end-to-end. No installs, no signup walls, no hidden costs. Just learn.

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