Question 1

How can I practice SQL for free?

Accepted Answer

The practice page offers 110+ interactive SQL exercises, organized by difficulty, with a full solution and the table schema for every question. All free, no signup required.

Question 2

Which database do the exercises use?

Accepted Answer

The exercises are based on the Northwind database — customers, orders, products, employees, and suppliers. The table-schema panel on the page shows every column so you know what to write against.

Question 3

Is this practice suitable for job-interview prep?

Accepted Answer

Yes. The exercises build up gradually from the basics to data-analyst interview-level questions, including JOIN, GROUP BY, subqueries, and Window Functions.

Interactive SQL Practice