SQL 문제 29 - Revising Aggregations - The Sum Function(HackerRank)

SQL 문제 29 - Revising Aggregations - The Sum Function(HackerRank) Revising Aggregations - The Sum Function 풀이 SELECT SUM(POPULATION) FROM CITY WHERE DISTRICT = 'California'; - 'California' 구역의 POPULATION 총 값을 구하는 문제 * 출처 Revising Aggregations - The Sum Function | HackerRank Query the total population of all cities for in the District of California. www.hackerrank.com...