16 lines
884 B
MySQL
16 lines
884 B
MySQL
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-- List for each continent and each possible number of items per purchase (in the range 1...10), the corresponding number of purchases. Only consider countries that are 100% located in their respective continents.
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-- How do you treat the default case as showed in the instructions?
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-- Expected Heading: RELATION {continent CHARACTER, qty INTEGER, cnt INTEGER}
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-- How do you treat the case where a country is splitted into two continents?
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SELECT continent.name AS continent, qty, COUNT(qty) AS cnt
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FROM continent
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JOIN Encompasses ON Encompasses.continent = continent.name AND Encompasses.percentage = 100.0
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JOIN country ON country.code = Encompasses.country
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JOIN province ON province.country = country.code
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JOIN Purchases ON Purchases.province = province.ROWID
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WHERE qty <= 10 AND qty >= 1 AND time > date((SELECT MAX(time) FROM Purchases),'-10 days')
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GROUP BY continent.name, qty
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;
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