The Best SQL Practice: Real World Interview Questions

Do you know the basics of SQL but you feel feel that you lack practical experience? You are not alone. Many beginners understand what SELECT and GROUP BY do, but they struggle to combine them to answer real business questions during technical interviews.

Welcome,

At this course we bridge the gap between theory and practice. We don’t just talk about code; we act as Data Analysts for a fictional e-commerce company. We will use PostgreSQL to analyze real-world data, calculate revenue, track the best customers , and find helpful insights in the data.

What will you practice in this course? Based on real interview questions, we will cover:

• Business Aggregations: Use COUNT, SUM, and AVG to calculate total orders and revenue per channel.
• Advanced Logic: Understand exactly when to use HAVING vs. WHERE to filter complex results.
• Customer Analysis: Solve complex scenarios like “Who bought this year but not last year?”
• Date Trends: Analyze sales performance by year and month using Date functions.
• Window functions
  • With, Case, Sub queries and all the most advanced and complex SQL methods.

How is the course structured?

We believe in learning by doing. The course is divided into three main parts:

1. Guided Exercises
2. Self-Practice
3. Detailed Solutions

Who is this course for?

• Aspiring Data Analysts preparing for technical interviews.
• Students and Juniors who want to build a portfolio.
• Anyone who wants to move from “learning SQL” to “using SQL.”

Enroll today and start building your practical data skills!