18 lines
445 B
MySQL
18 lines
445 B
MySQL
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-- Determine the 10 countries with the most purchases; list the names of these countries, as well as the number of purchases; sort the results in decreasing order of purchases.
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SELECT name, cnt
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FROM (
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SELECT country, sum(qty) as cnt
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FROM (
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SELECT province, sum(qty) as qty
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FROM Purchases
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GROUP BY province
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)
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JOIN province ON province = province.ROWID
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GROUP BY country
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ORDER BY cnt DESC
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LIMIT 10
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)
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JOIN COUNTRY on country == code
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;
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