PostgreSQL Exercises
PostgreSQL Exercises is a free online resource that helps you practice SQL queries on a sample database. It covers a wide range of topics, from basic SELECT statements to complex JOIN operations and subqueries.
It’s free, no registration required, and you can start practicing right away. The exercises are extremely helpful for interview preparation, learning SQL, or refreshing your database skills.
Big thanks to Alisdair Owens for creating and maintaining this fantastic resource!