HACKERRANK BASIC 시작!

Revising the Select Query I

SELECT * FROM CITY WHERE (COUNTRYCODE LIKE 'USA') AND (POPULATION > 100000);

조건문 괄호로 따로 묶어주기

Weather Observation Station 3

SELECT DISTINCT CITY FROM STATION WHERE (ID % 2 = 0);

중복값 없이 DISTINCT

9문제 완료