PostgreSQL Exercises

Website

pgexercises.com

$ Details

-

Platforms

-

Release Date

-

Listed in

#Online Learning #Online Education #Online Courses #Data Management

Calcumber

Website

calcumber.app

$ Details

free

Platforms

Web Windows Linux Mac

Release Date

2025 June

Listed in

#Education #Math Tools #Online Calculators #Engineering Calculator #Math Calculators #Math Solver

Startup details

Country

Switzerland

State

Aargau

City

Staufen

Founder(s)

Samuel Hartmann

Employees

1 - 9

PostgreSQL Exercises features and specs

• 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 of PostgreSQL Exercises

• 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• Outdated design and interface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.

Calcumber features and specs

• 🌿 Naturally type expressions
  get immediate results
• 🔗 Copy and share
  keep calculations editable with a link
• 🧩 Variables and constants
  pi, e, G, mu0
• 🧪 Scientific functions
  sin, acos, log, round, and more
• ♨️ Thermodynamic fluid properties
  refrigeration, heat pumps, steam and air
• 💡 Installation optional
  run directly in your browser
• 📱 Multi-platform
  WebApp, Windows, more to come

Analysis of PostgreSQL Exercises