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혜온의 이것저것
[HackerRank] Average Population of Each Continent (MySQL) 본문
Data Analysis/SQL
[HackerRank] Average Population of Each Continent (MySQL)
혜온 :) 2022. 8. 29. 15:19https://www.hackerrank.com/challenges/average-population-of-each-continent/problem?isFullScreen=true
문제
Given the CITY and COUNTRY tables, query the names of all the continents (COUNTRY.Continent) and their respective average city populations (CITY.Population) rounded down to the nearest integer.
Note: CITY.CountryCode and COUNTRY.Code are matching key columns.
Input Format
The CITY and COUNTRY tables are described as follows:
풀이
select c2.continent, floor(avg(c1.population))
from city c1, country c2
where c1.countrycode = c2.code
group by c2.continent
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