Query with confidence
SELECT, WHERE, LIKE, BETWEEN, ORDER BY — the everyday SQL that answers real questions.
What you'll build
Real skills, real projects — not another slide deck.
Aggregate and group
GROUP BY, HAVING and aggregate functions to turn rows into summaries and reports.
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.
- Queries against a real relational database
- Grouped summary reports with aggregates
- Multi-table joins on a realistic schema
- Advanced queries using subqueries, CTEs and window functions
- A SQL reporting project for your portfolio
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.
The ONROL method
Build the evidence. Keep the proof.
ONROL is an execution school, not a lecture hall. Every session you ship something real — an automation, an agent, an app — and you keep it. You don't leave with a certificate alone; you leave with a portfolio of working AI products that proves what you can do.
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Where to take this at ONROL.
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Explore program →Questions
Straight answers.
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.
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 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.
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.
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