SQL Essentials for Business Professionals

In today's data-driven world, SQL (Structured Query Language) is the universal language of data. From analysts and engineers to product managers and business leaders, the ability to query, manipulate, and interpret data is no longer optional — it is a fundamental professional skill.

This free, self-paced SQL course is designed to build proficiency from the ground up. Starting with core database concepts and progressing through advanced functions, window analytics, performance tuning, and interview-ready theory, learners gain both the technical depth and practical fluency that employers demand.

Built around PostgreSQL — one of the most widely adopted open-source databases — the course uses real-world case studies, step-by-step demonstrations, and curated exercises to ensure every concept is understood and applied, not just memorised.

Course Highlights

1. 6 comprehensive modules covering beginner to advanced SQL
2. Hands-on installation, setup, and case study walkthroughs
3. Full coverage of Joins, Subqueries, Views, and Indexes
4. String, Mathematical, Date-Time, and Window Functions
5. Interview-ready topics: Normalisation, ACID compliance, Primary & Foreign Keys
6. 8 performance optimisation tips for real-world query efficiency
7. 100% free — no payment, no barrier to entry

You will Learn

1. Write and optimise SQL queries using PostgreSQL from scratch
2. Perform complex data filtering, aggregation, and conditional logic
3. Master all major JOIN types and combine datasets with set operations
4. Apply String, Mathematical, Date-Time, and Window functions to real datasets
5. Design normalised database schemas and understand ACID principles
6. Identify and resolve query performance bottlenecks using practical tips
7. Prepare confidently for SQL-based data interviews and assessments