QuerydrillSpend per customer
An SQL exercise from Querydrill. Solve it with a SQL editor in your browser, checked on the rows it returns and again on changed data, and it is checked the moment you submit.
The task
For each customer_id, return the customer_id and the total amount of their paid orders. Customers without paid orders do not appear.
What this exercise teaches
WHERE runs before GROUP BY, so it decides which rows get aggregated.
A hint if you get stuck
Filter with WHERE before grouping, then SUM(amount).
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