SQL + ER Modeling Practice

Write smarter queries.
Build better models.

Instant feedback. Progress tracking. Master SQL before your next exam or interview.

-- top customers by revenue
SELECT c.customerName,
SUM(od.quantityOrdered * od.priceEach)
AS revenue
FROM Customers c
JOIN Orders o USING (customerNumber)
GROUP BY c.customerName
ORDER BY revenue DESC
18 rows ยท matches solution
Targeted practice

Hand-picked SQL questions and ER tasks, from basic joins to complex window functions. Learn by doing.

Smart feedback

Real-time query evaluation. See exactly where your output diverges from the solution.

Built for the course

Structured around real course content. Ace your assignments and come out ready for interviews.