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TEAM EDA
[HackerRank] Basic Join : Average Population of Each Continent 본문
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 O.CONTINENT, FLOOR(AVG(C.POPULATION))
FROM CITY AS C
JOIN COUNTRY AS O ON C.COUNTRYCODE = O.CODE
GROUP BY O.CONTINENT'EDA Study > SQL' 카테고리의 다른 글
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| [HackerRank] Basic Join : Asian Population (0) | 2021.02.08 |
| [HackerRank] Basic Select : Employee Salaries (0) | 2021.02.07 |
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