PostgreSQL Exercises VS SQL Teaching

• Free and accessible
  PostgreSQL Exercises is completely free to use with no registration required, making it highly accessible to anyone who wants to practice SQL skills without any financial barrier.
• Interactive practice environment
  The site provides a built-in SQL query editor where users can write and execute queries directly in the browser against a real database, getting immediate feedback on their results.
• Progressive difficulty
  Exercises are well-organized into categories (basic, joins, aggregation, date, string, recursive) and progress from simple to complex, allowing learners to build their skills incrementally.
• Realistic dataset
  The site uses a realistic country club management scenario with interconnected tables, giving learners practice with a coherent and relatable data model rather than abstract or disconnected examples.
• Detailed solutions and explanations
  Each exercise comes with a detailed expected result set and a thorough explanation of the solution, helping learners understand not just what the answer is but why it works.

Possible disadvantages

• Limited dataset scope
  The entire site relies on a single small dataset (a country club with members, facilities, and bookings), which limits exposure to diverse data modeling patterns and real-world complexity.
• No user progress tracking
  Since there is no account system or registration, the site does not track user progress, making it difficult for learners to pick up where they left off or monitor their improvement over time.
• PostgreSQL-specific syntax
  The exercises focus specifically on PostgreSQL syntax and features, which may not directly translate to other database systems like MySQL, SQL Server, or Oracle, potentially limiting transferability of learned skills.
• Outdated design and interface
  The website has a dated visual design and user interface that lacks modern UX features such as syntax highlighting, auto-completion, or responsive mobile support, making it less pleasant to use compared to newer platforms.
• Limited number of exercises
  The total number of exercises is relatively small compared to other competitive programming or SQL practice platforms, meaning advanced users may quickly exhaust the available problems.

• Interactive Learning
  SQL Teaching provides an interactive, hands-on environment where users can write and execute SQL queries directly in the browser, allowing them to practice and see results immediately without needing to set up a local database.
• Beginner-Friendly
  The platform is designed with beginners in mind, starting from the very basics of SQL such as SELECT statements and gradually building up to more complex topics, making it accessible to people with no prior SQL experience.
• Free to Use
  SQL Teaching is completely free with no paywalls, subscriptions, or hidden costs, making it an accessible resource for anyone who wants to learn SQL regardless of their financial situation.
• Progressive Lesson Structure
  The lessons are organized in a logical, step-by-step progression where each lesson builds on the previous one, helping learners gradually develop their SQL skills in a structured manner.
• Minimalist and Distraction-Free
  The website has a clean, simple interface without ads or unnecessary clutter, allowing learners to focus entirely on the SQL content and exercises without distractions.

Possible disadvantages

• Limited Depth of Content
  The platform covers only basic SQL concepts and does not delve into more advanced topics such as window functions, CTEs, stored procedures, indexing, or database optimization, limiting its usefulness for intermediate or advanced learners.
• No User Accounts or Progress Tracking
  SQL Teaching does not offer user accounts or persistent progress tracking, meaning learners cannot save their progress and must start over or manually keep track of where they left off between sessions.
• Lack of Real-World Scenarios
  The exercises use simplified, small datasets and scenarios that do not reflect the complexity of real-world databases, which may leave learners unprepared for practical, on-the-job SQL tasks.
• No Community or Support Features
  The platform lacks a community forum, discussion boards, or any form of instructor support, so learners who get stuck have no built-in way to ask questions or get help from others.
• Limited Explanations and Theory
  The instructional content for each lesson is quite brief and does not provide in-depth explanations of underlying database concepts or theory, which may leave learners with gaps in their understanding of how and why SQL works the way it does.

• Learn SQL by Typing It: Three Browser Database Terminals Compared

  Disclosure: I help build these simulators; they are part of 50+ free DevOps games and simulators. For more practice beyond them, SQLBolt and PostgreSQL Exercises are excellent and free, and SQL Murder Mystery is the most fun anyone has... - Source: dev.to / 2 months ago

Tracking SQL Teaching since May 2026.