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This SQL query is designed to analyze customer spending in relation to the average invoice total. It focuses on identifying customers whose total spending is significantly lower than the average, specifically those who have spent less than a quarter of the average invoice total. This could be useful for businesses looking to identify low-spending customers for targeted marketing or other business strategies.
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The SQL query works by joining the 'customer' and 'invoice' tables on the 'id' field of the customer table and the 'customer_id' field of the invoice table. It then groups the results by customer name and calculates the sum of the total price for each customer. The HAVING clause is used to filter out customers whose total spending is less than a quarter of the average total price of all invoices. The results are then ordered in descending order by the rounded sum of the total price.
SELECT c.customer_name, ROUND(SUM(i.total_price), 6) FROM customer c INNER JOIN invoice i ON c.id=i.customer_id GROUP BY c.customer_name HAVING SUM(i.total_price)<0.25*(SELECT AVG(total_price) FROM invoice) ORDER BY ROUND(SUM(i.total_price), 6) DESC;
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