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  1. Prepare
  2. SQL
  3. Basic Join
  4. Average Population of Each Continent
  5. Discussions

Average Population of Each Continent

  • hatrangqluu
     + 0 comments
     SELECT ctr.continent
, sum(ct.population) div count(ct.name) as avg_city_population
from city ct
join country ctr 
on ct.countrycode = ctr.code
GROUP BY ctr.continent;