Name a step with a CTE in SQL
SQL interview exercise on Subqueries & CTEs, difficulty 2 of 3. Solve it in the editor beside a worked example, or cold in Interview mode with the example hidden; the tests run the moment you do.
Return each customer's number of orders and average order value, rounded to 2 decimals, ignoring cancelled orders. An order's value is the sum of its lines, so total the orders first, then average those totals. Columns: customer, orders, avg_order. Highest average first, then by customer.
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Interview mode hides the example: solve it from memory, without the hint or the solution, and it counts as solved cold. Progress is saved in your browser, and in your account if you sign in.