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SELECT
customerGroup,
COUNT(cg.customerGroup) AS groupCount
FROM
(SELECT
customerNumber,
ROUND(SUM(quantityOrdered * priceEach)) sales,
(CASE
WHEN SUM(quantityOrdered * priceEach) < 10000 THEN 'Silver'
WHEN SUM(quantityOrdered * priceEach) BETWEEN 10000 AND 100000 THEN 'Gold'
WHEN SUM(quantityOrdered * priceEach) > 100000 THEN 'Platinum'
END) customerGroup
FROM
orderdetails
INNER JOIN orders USING (orderNumber)
WHERE
YEAR(shippedDate) = 2003
GROUP BY customerNumber) cg
GROUP BY cg.customerGroup;