SQL – Home

Welcome to the CodesCompiler SQL course! This series is built around a fictional online academy called CodesCompiler Academy, which has students, courses, instructors, and enrollments stored in a real SQLite database. Every tutorial you complete will use this same dataset — so instead of random abstract examples, you will always be working with something familiar.

By the end of this series, you will be able to extract insights from any dataset, transform raw numbers into meaningful reports, and design databases that scale from a dozen records to billions.

The CodesCompiler Academy Database Our practice database has four tables:

Table	What it stores
students	Name, age, city, grade, score
courses	Title, instructor, category, price, rating
enrollments	Which student took which course
instructors	Teacher profiles and ratings

Try It Yourself — Interactive SQL Editor

Edit the query below and click Run Query ▶ to see live results powered by SQLite running directly in your browser.

Key Points

• Every SQL course uses tables — structured grids of data
• Primary keys uniquely identify each row
• Foreign keys link tables together
• You query data with SELECT statements

Pro Tip from CodesCompiler: The best way to learn SQL is to break things intentionally — modify the query above, change the WHERE conditions, try different columns. Every error teaches you something the docs cannot.

In the next lesson, we continue exploring SQL’s powerful feature set to build your database mastery.