[SQL문제풀기] Japan Population

문제

Japan Population | HackerRank

Query to the sum of the populations of all Japanese cities in CITY.

https://www.hackerrank.com/challenges/japan-population/problem?isFullScreen=true

MySQL, Oracle, MS SQL Server, DB2

내가 작성한 정답

select sum(population)
from city
where countrycode = 'JPN';