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Update 4_soutions.sql: Easier solution for question 9 #11

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Update 4_soutions.sql: Easier solution for question 9 #11

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16 changes: 7 additions & 9 deletions 4_soutions.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -36,14 +36,12 @@ SELECT continent, name FROM world x WHERE name <= ALL(SELECT name FROM world y W

--9. Find the continents where all countries have a population <= 25000000. Then find the names of the countries associated with these continents. Show name, continent and population.

SELECT name, continent, population FROM world WHERE continent IN (SELECT continent FROM world x WHERE 25000000 >= (SELECT MAX(population) FROM world y WHERE x.continent = y.continent));
or
SELECT y.name, y.continent, y.population
FROM world AS y
JOIN
(SELECT continent,max(population)
SELECT name, continent, population
FROM world
GROUP BY continent
HAVING max(population) <= 25000000) AS x
ON y.continent = x.continent
WHERE continent IN (
SELECT continent
FROM world
GROUP BY continent
HAVING MAX(population) <= 25000000
)