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[DB/SQL오답노트/HackerRank] Average Population of Each Continent

1.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: 2.내 풀이 SELECT COUNTRY.Continent, trunc(avg(CITY.population)) FROM ..