후기

내일이 프로젝트 마감이자 발표일이다.
쉬어가는 느낌으로 딱 3문제만 풀겠습니다... ;_;

문제

Given the CITY and COUNTRY tables, query the sum of the populations of all cities where the CONTINENT is 'Asia'.
Note: CITY.CountryCode and COUNTRY.Code are matching key columns.
Input Format
The CITY and COUNTRY tables are described as follows:

풀이

SELECT SUM(CITY.POPULATION) 
FROM CITY 
JOIN COUNTRY ON CITY.COUNTRYCODE = COUNTRY.CODE 
WHERE COUNTRY.CONTINENT = 'Asia';