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Solution for 10th question in SELECT within SELECT #10

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Solution for 10th question in SELECT within SELECT #10

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10 changes: 10 additions & 0 deletions 4_soutions.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -47,3 +47,13 @@ GROUP BY continent
HAVING max(population) <= 25000000) AS x
ON y.continent = x.continent

--10. Some countries have populations more than three times that of any of their neighbours (in the same continent). Give the countries and continents.
SELECT name, continent
FROM world w1
WHERE population >=
ALL(
SELECT population * 3 FROM world w2
WHERE w1.continent = w2.continent
AND w1.name <> w2.name
)