Aggregate and group
GROUP BY, HAVING and aggregate functions to turn rows into summaries and reports.
What you'll build
Skills you build, not just hear about.
Join across tables
Keys, relationships, joins and unions — pull data from multiple tables correctly.
Advanced SQL
Subqueries, CTEs and window functions — the SQL that marks out capable analysts.
Query with confidence
SELECT, WHERE, LIKE, BETWEEN, ORDER BY — the everyday SQL that answers real questions.
- Grouped summary reports with aggregates
- A SQL reporting project for your portfolio
- Advanced queries using subqueries, CTEs and window functions
- Queries against a real relational database
- Multi-table joins on a realistic schema
Who it's for
The most employable data skill, fast
SQL is everywhere data lives — and knowing it well is one of the fastest, most reliable ways into analytics and data roles. Almost every analyst, business, product and data job touches SQL, and it's genuinely learnable in weeks, not years.
This course is built for beginners, analysts and professionals who want a concrete, in-demand skill. ONROL is project-first, so you finish with real queries and reports in a portfolio — the demonstrable SQL ability that data-analyst and BI interviews look for.
How ONROL works
Learn by shipping, not by watching.
This isn't a lecture series. Each session ends with a working thing you built — a bot, a workflow, an app — and it's yours to keep. What you walk away with is a body of real AI work, not a certificate that sits in a drawer.
Programs to consider
Where to take this at ONROL.
AI Architect
The advanced track — AI architecture, agents, RAG and production-grade systems.
Explore program →AI Career Accelerator
A 21-day career-focused entry — practical AI skills, real projects and job readiness.
Explore program →AI Generalist
The 3-month flagship — build 5+ real AI systems and a portfolio, no coding required.
Explore program →Good to know
Straight answers.
Is SQL still worth learning?
Very much. SQL remains one of the most in-demand and durable data skills — nearly every analytics, business and data role uses it, and it's a fast route into those jobs.
What will I have to show?
Real queries and a SQL reporting project in a portfolio — the demonstrable skill that data-analyst and BI interviews want to see.
What database does the course use?
You work with real relational databases (MySQL/PostgreSQL-style), covering everything from basic queries to joins, CTEs and window functions on realistic data.
Do I need coding experience for SQL?
No. SQL is a query language that reads almost like English, and the course starts from the basics. Beginners, analysts and business professionals learn it comfortably.
Reserve your seat
Start here. One short form.
Drop your details and our team confirms the next live cohort and answers anything about the program, timing and outcomes.
Request received.
Thank you — our team will reach out shortly with the next cohort details.