SQL and Databases
SQL is the most stable skill in IT. We will teach you to write queries of any complexity in 4 weeks. Add this item to your resume — and your salary will grow by 30%.
Why SQL?
#1 Data Skill
SQL is the most universal data skill — used in every company, every role, every day.
Easy to Start
Simple declarative syntax. Write your first query in minutes, master complex analytics in weeks.
Always Relevant
50 years and still irreplaceable — SQL outlasts every framework and language.
30% Salary Boost
Adding SQL to your resume increases your market value by 30% on average.
Who is this course for
For beginners who want to master SQL from scratch — analysts, backend developers, and anyone working with data.
Technologies You'll Master
SQL
Standard language for relational database queries.
PostgreSQL
Advanced open-source relational database.
MySQL
Popular relational database for web applications.
pgAdmin
Admin tool for PostgreSQL management.
DBeaver
Universal database tool and SQL client.
Window Functions
Analytical queries over partitioned data.
CTE
Common Table Expressions for complex queries.
Normalization
Database design for data integrity.
Indexes
Query performance optimization.
Transactions
ACID compliance for data consistency.
Course Program
Foundations
- SELECT, FROM, WHERE, ORDER BY, LIMIT.
- Aggregates (COUNT, SUM, AVG, MIN, MAX) and GROUP BY.
- Assignment: analyze sales data..
Joins & Subqueries
- JOIN (INNER, LEFT, RIGHT, FULL), subqueries (scalar, table).
- UNION, INTERSECT.
- Assignment: a query to select orders with customer and product details..
Window Functions & Optimization
- Window functions (ROW_NUMBER, RANK, LAG/LEAD), CTE.
- Indexes, EXPLAIN.
- Assignment: optimize a slow query..
Transactions & Database Design
- Transactions (ACID, isolation levels).
- Database design: normalization, ER-diagrams.
- Working with PostgreSQL and MySQL.
- Final.
Bonuses
- Online simulator with 300+ tasks for 3 months
- Ready-made backup scripts
- Chat with the instructor
Format
Video lectures + interactive exercises in a web environment (pgAdmin, DBeaver).
Result
Fluency in SQL at a level sufficient for an analyst or backend developer.