32. Write a query based on the BOOKS table which will display a category and the average profit for books within that category. Profit is the difference between the retail price and the cost. Answer: 33. Write a query based which will determine the number of books which have been shipped in each category. Identify (list) the category in the output. Answer: 34. Write a query which will determine the number of categories contained in the BOOKS table. Answer:
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To do this, we need to calculate the average profit for each category. The profit is the difference between the retail price and the cost. We can use the following query: SELECT category, AVG(retail_price - cost) AS average_profit FROM BOOKS GROUP BY category; Show more…
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