Complete beginners
Start with database fundamentals and your first guided queries.
Online SQL training · available worldwide
Learn SQL online through practical business cases
Build job-relevant SQL skills by writing queries from the first module. SQL.tn combines concise lessons, instant result validation and realistic data projects in one browser-based workspace.
Self-paced SQL training for an international audience
Study from any time zone without installing a database. The examples cover sales, customers, products, marketing and operational metrics that transfer across industries. International prices can be displayed in US dollars; online payments remain disabled during the current testing phase.
Learn by querying data, not by watching passively
Every activity starts with a clear business question and an understandable schema. You write and run SQL, inspect the result, request progressive hints when needed and then review an explained solution.
SQL skills covered
- Explore unfamiliar data with SELECT, WHERE and ORDER BY.
- Join tables while controlling grain and duplicate rows.
- Build reliable KPIs with GROUP BY, CASE, CTEs and window functions.
- Analyse customers, revenue, cohorts and time-based performance.
- Advance in PostgreSQL with transactions, indexes, EXPLAIN and permissions.
Who the training is for
Data Analysts
Practise reporting, metrics, segmentation and data-quality checks.
Job candidates
Prepare for SQL interviews with timed questions and business cases.
A clear learning loop
- 1Understand
A concise lesson explains the problem before the syntax.
- 2Query
Write and execute SQL in the integrated browser workspace.
- 3Review
Use result checks, progressive hints and detailed corrections.
- 4Apply
Complete projects that combine several skills in context.
What is available on SQL.tn
structured lessons
interactive exercises
business projects
Questions about online SQL training
Can I access SQL.tn from any country?
Yes. The learning workspace runs in a modern browser and can be used worldwide without installing a local database.
Do I need programming experience?
No. SQL Foundations starts with tables, rows and simple queries before introducing joins and aggregation.
Is there a free way to start?
Yes. The first activities and the SQL level test can be opened without entering card details.
Does the training cover Data Analyst skills?
Yes. The Data Analyst path covers KPIs, CTEs, window functions, segmentation, cohorts and data-quality controls.
Run your first SQL query today
Start with free activities, then follow the path that matches your goal.