Save a query as a view in SQL
SQL interview exercise on Schema Design, 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.
Create a view called order_totals with one row per order and the columns order_id, customer_id and total, where total is the sum of quantity × unit_price over the order's lines.
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.