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SELECT p.continent,
FLOOR(COALESCE(AVG(NULLIF(c.population, 0)), 0)) AS avg_city_population
FROM Country AS p
LEFT JOIN City AS c ON p.code = c.countrycode
GROUP BY p.continent;
why this is wrong
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Average Population of Each Continent
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SELECT p.continent, FLOOR(COALESCE(AVG(NULLIF(c.population, 0)), 0)) AS avg_city_population FROM Country AS p LEFT JOIN City AS c ON p.code = c.countrycode GROUP BY p.continent;
why this is wrong