QuerydrillRevenue per category
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
Return each product category with its revenue from order lines (quantity times price).
What this exercise teaches
Changing the GROUP BY column rolls the same numbers up to a different level.
A hint if you get stuck
Same join as revenue per product, grouped by category.
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