Answers to all tutorials from SQLZoo; content from: http://sqlzoo.net/wiki/SQL_Tutorial.
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answer 11, 12, 13 are incorrect. can you check? solution 6
wrong answer
Line 10 in 07e356b
correct answer is
SELECT name FROM world
WHERE continent='Europe' AND gdp/population > (SELECT gdp/population FROM world WHERE name='United Kingdom')
A solution that can be easily understood for question 9
select y.name, y.continent, y.population
from world as y
Join
(select continent,max(population)
from world
group by continent
having max(population) <= 25000000) as x
on y.continent = x.continent
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