RO
The essential language for every developer. Learn queries, joins, subqueries, indexing and optimization. 14 modules, 55+ practical exercises with real databases.
The essential skill for every developer
Extract and analyze data from any database
INNER, LEFT, RIGHT, FULL and CROSS JOINS
Indexing, query plans and performance
Works with MySQL, PostgreSQL, SQL Server
14 modules from basics to advanced
+ 6 advanced modules including:
CTEs (WITH) • Window Functions • Indexing • Query Optimization • Transactions • Final Projects
Explore SQL before you buy
SQL (Structured Query Language) is the standard language for interacting with relational databases. You'll use it to:
SQL is case-insensitive for keywords, but the convention is to write them in UPPERCASE for readability.
-- Select all employees from the IT department
SELECT
first_name,
last_name,
salary,
hire_date
FROM employees
WHERE department = 'IT'
AND salary > 5000
ORDER BY salary DESC
LIMIT 10;
JOINs allow you to combine data from multiple tables:
-- Employees with their departments
SELECT
e.name,
e.salary,
d.department_name
FROM employees e
INNER JOIN departments d
ON e.department_id = d.id
WHERE d.location = 'New York';
Go to the "Editor" tab and write your own queries!
"I learned SQL from scratch and now I write complex queries for reports. The JOINs section was a revelation!"
"The course helped me pass the technical interview. Window functions and CTEs were exactly what I was looking for!"
"The most practical SQL course. The exercises with real databases make the difference."
From basic queries to advanced optimization. Master databases.
💡 All prices shown do not include VAT or other applicable local taxes. Taxes will be calculated at checkout based on your location.
SQL is used by 90% of companies that work with data. Learn it now.
🛒Buy Course - €40💡 All prices shown do not include VAT or other applicable local taxes. Taxes will be calculated at checkout based on your location.