Advanced SQL CASE WHEN Exercises

Advanced-level SQL CASE WHEN practice exercises with solutions.

Exercise 1

Question: Count orders by status (Pending, Shipped, Delivered).

SELECT 
  COUNT(CASE WHEN status = 'pending' THEN 1 END) AS pending_count,
  COUNT(CASE WHEN status = 'shipped' THEN 1 END) AS shipped_count,
  COUNT(CASE WHEN status = 'delivered' THEN 1 END) AS delivered_count
FROM orders;

CASE inside aggregate functions allows pivoting data. This turns row values into columns.