Learn SQL faster using a PostgreSQL online editor with preloaded demo databases. No setup required — just open, run queries, and explore real-world datasets.

If you're searching for:
- SQL practice online
- PostgreSQL playground
- Sample databases for SQL learning
- Learn SQL with real data

You're in the right place.

Most beginners struggle with one thing:

> “What do I actually query?”

Instead of creating tables from scratch, you can:
- Practice SQL instantly
- Explore real schemas
- Learn joins, aggregations, and relationships naturally

This demo database includes:
- Users
- Products
- Categories (hierarchical)
- Product-category relationships

SELECT id, title, parentId
FROM category;

SELECT c.title, COUNT(*) as product_count
FROM category c
JOIN product_category pc ON c.id = pc.categoryId
GROUP BY c.title
ORDER BY product_count DESC;

👉 Learn:
- Many-to-many relationships
- Hierarchical data modeling
- Backend schema design

This database includes:
- Customers
- Orders
- Products
- Order items
- Payments

SELECT * FROM customers;
SELECT * FROM orders;

SELECT c.first_name, SUM(o.total_amount) AS revenue
FROM customers c
JOIN orders o ON c.customer_id = o.customer_id
GROUP BY c.first_name
ORDER BY revenue DESC;

SELECT 
    c.first_name,
    o.order_id,
    p.product_name,
    oi.quantity,
    oi.price
FROM customers c
JOIN orders o ON c.customer_id = o.customer_id
JOIN order_items oi ON o.order_id = oi.order_id
JOIN products p ON oi.product_id = p.product_id;

👉 Learn:
- SQL joins across multiple tables
- Aggregations (SUM, COUNT)
- Business analytics queries

Using a PostgreSQL demo database helps you:
- Learn SQL faster with real data
- Understand relationships visually
- Build confidence in writing queries
- Prepare for interviews and real-world projects

- Add filters using WHERE
- Use GROUP BY and HAVING
- Write your own JOIN queries
- Explore database relationships

Open the PostgreSQL editor, pick a demo database, and start querying.

No installation. No setup. Just SQL.