I am a beginner
SQL Foundations
From your first query to a complete business analysis: filters, calculations, dates, aggregations, joins and CTEs.
20 structured lessonsView the path →SQL.tn courses and training
Online SQL training: choose your course and practise.
Learn SQL through a progressive path, focused micro-courses, solved exercises and business projects. Start without installing anything and follow your goal.
Three starting points
Choose according to your goal.
I want to analyse data
SQL for Data Analysts
Prepare metrics with aggregations, dates, CTEs and window functions.
10 structured lessonsView the path →I want to go further
Advanced SQL with PostgreSQL
Transactions, performance, automation and security in a real PostgreSQL environment.
8 structured lessonsView the path →Included practice paths
Progress with SQL 50 or prepare for an interview.
These focused paths reuse the existing catalogue and keep one shared progression.
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Find your next skill.
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25 results
25 resources currently available
Learning pathAvailable
SQL Foundations
From your first query to a complete business analysis: filters, calculations, dates, aggregations, joins and CTEs.
- Level
- Beginner
- Duration
- About 10 hours
- Practice
- 20 lessons · 44 exercises SQL Essentials
First activities freeView syllabus
Micro-courseAvailable
Why does SQL exist?
Understand why companies use databases, then write your first query to solve a real problem.
- Level
- Complete beginner
- Duration
- 35 to 45 min
- Practice
- 5 lessons · 5 exercises
FreeView syllabus
ProjectAvailable
Analyze the sales of a network of stores
Build revenue indicators from fictitious sales spread across multiple cities and channels.
- Level
- Beginner
- Duration
- 45 to 60 min
- Practice
- 8 guided missions
Free accountView syllabus
Learning pathAvailable
SQL for Data Analysts
Prepare metrics with aggregations, dates, CTEs and window functions.
- Level
- Intermediate
- Duration
- 8–12 h
- Practice
- 10 lessons · 10 guided missions
SQL AnalystView syllabus
Learning pathAvailable
Advanced SQL with PostgreSQL
Transactions, performance, automation and security in a real PostgreSQL environment.
- Level
- Advanced
- Duration
- 8–12 h
- Practice
- 8 lessons · 8 guided missions
SQL ProView syllabus
Learning pathAvailable
SQL for Power BI — guided theory
Understand the principles behind preparing a reliable SQL source for a Power BI model.
- Level
- Intermediate
- Duration
- 75–90 min
- Practice
- 6 lessons · 8 exercises · 1 guided missions
SQL AnalystView syllabus
Learning pathAvailable
SQL interview preparation
Practise common questions and realistic hands-on cases.
- Level
- Intermediate
- Duration
- 3 × 45 min
- Practice
- 30 exercises · 3 × 45 min
SQL ProView syllabus
Micro-courseAvailable
SQL, PostgreSQL, MySQL and SQL Server: what is the difference?
Understand the language, systems and dialects so you can choose the right documentation and write portable SQL with judgement.
- Level
- Beginner
- Duration
- 45 to 60 min
- Practice
- 5 lessons · 6 exercises
Included in beta accessView syllabus
Micro-courseAvailable
Keep data reliable with constraints
Stop invalid data in the right place with types, keys and constraints.
- Level
- Beginner / intermediate
- Duration
- 60 min
- Practice
- 6 lessons · 8 exercises
Included in beta accessView syllabus
Micro-courseAvailable
Secure an operation with transactions
Make several related changes succeed or fail together.
- Level
- Intermediate
- Duration
- 60 to 75 min
- Practice
- 6 lessons · 8 exercises
Included in beta accessView syllabus
Micro-courseAvailable
Automate PostgreSQL with triggers
React to a data event without hiding business logic unnecessarily.
- Level
- Intermediate
- Duration
- 75 to 90 min
- Practice
- 6 lessons · 10 exercises
Included in beta accessView syllabus
Micro-courseAvailable
Create views and materialized views
Reuse query logic and decide when its result should be materialized.
- Level
- Intermediate
- Duration
- 60 to 75 min
- Practice
- 5 lessons · 7 exercises
Included in beta accessView syllabus
Micro-courseAvailable
Speed up a query with indexes and EXPLAIN
Read a simple plan and add an index only when it solves a measured problem.
- Level
- Intermediate
- Duration
- 75 to 90 min
- Practice
- 6 lessons · 9 exercises
Included in beta accessView syllabus
Micro-courseAvailable
PostgreSQL functions and procedures
Encapsulate database-side logic while understanding its cost and alternatives.
- Level
- Intermediate / advanced
- Duration
- 90 min
- Practice
- 6 lessons · 9 exercises
Included in beta accessView syllabus
Micro-courseAvailable
Roles, permissions and data security
Grant only the access required and understand row-level security.
- Level
- Intermediate
- Duration
- 60 to 75 min
- Practice
- 5 lessons · 7 exercises
Included in beta accessView syllabus
Micro-courseAvailable
SQL for Power BI: theoretical foundations
Understand how to prepare clean data at the right grain before working in Power BI.
- Level
- Intermediate
- Duration
- 75 to 90 min
- Practice
- 6 lessons · 8 exercises
Included in beta accessView syllabus
Micro-courseAvailable
Window functions for business analysis
Compare, rank and calculate changes without losing row-level detail.
- Level
- Intermediate
- Duration
- 90 min
- Practice
- 6 lessons · 10 exercises
Included in beta accessView syllabus
Micro-courseAvailable
Control data quality with SQL
Turn data-quality suspicions into repeatable, prioritised checks.
- Level
- Intermediate
- Duration
- 60 to 90 min
- Practice
- 6 lessons · 9 exercises
Included in beta accessView syllabus
ProjectAvailable
Manage the margin of an e-commerce catalog
Link orders, lines and products to distinguish revenue, costs and margin by category.
- Level
- Intermediate
- Duration
- 75 to 100 min
- Practice
- 8 guided missions
SQL EssentialsView syllabus
ProjectAvailable
Track products and risk of shortage
Prepare inventory, revenue and coverage indicators for an operational team.
- Level
- Intermediate
- Duration
- 60 to 90 min
- Practice
- 8 guided missions
SQL AnalystView syllabus
ProjectAvailable
Segment customers according to their orders
Transform order history into useful segments for a marketing team.
- Level
- Intermediate
- Duration
- 60 to 90 min
- Practice
- 8 guided missions
SQL AnalystView syllabus
ProjectAvailable
Analyze the performance of a contact center
Connect queues, contacts, intervals and schedule to measure volume, abandonment, DMT and SLA without logging agents.
- Level
- Intermediate
- Duration
- 90 to 120 min
- Practice
- 8 guided missions
SQL AnalystView syllabus
ProjectAvailable
Measuring SaaS subscriptions and churn
Calculate MRR, revenue movements, logo churn, retention and cohorts from verifiable events.
- Level
- Advanced
- Duration
- 90 to 120 min
- Practice
- 8 guided missions
SQL ProView syllabus
ProjectAvailable
Analyze delays and delivery quality
Measure lead time, promise fulfillment, carriers, warehouses and time evolution.
- Level
- Advanced
- Duration
- 90 to 120 min
- Practice
- 8 guided missions
SQL ProView syllabus
ProjectAvailable
Studying absenteeism with respectful indicators
Calculate durations, trends and aggregated rates by department without exposing individual data.
- Level
- Advanced
- Duration
- 90 to 120 min
- Practice
- 8 guided missions
SQL ProView syllabus