Lim Seunghyun Space

문제 : https://www.hackerrank.com/challenges/weather-observation-station-3/problem?isFullScreen=true Weather Observation Station 3 | HackerRank Query a list of unique CITY names with even ID numbers. www.hackerrank.com 문제 해설 STATION 테이블에서 ID 번호가 짝수인 NAME을 조회 결과값에서 중복인 데이터는 제외 풀이 (MySQL) SELECT DISTINCT CITY FROM STATION WHERE ID % 2 = 0;

문제 : https://www.hackerrank.com/challenges/weather-observation-station-1/problem?isFullScreen=true Weather Observation Station 1 | HackerRank Write a query to print the CITY and STATE for each attribute in the STATION table. www.hackerrank.com 문제 해설 CITY 테이블에서 CITY 와 STATE를 조회 풀이 (MySQL) SELECT CITY, STATE FROM STATION;

문제 : https://www.hackerrank.com/challenges/japanese-cities-name/problem?isFullScreen=true Japanese Cities' Names | HackerRank In this challenge, you will query a list of all the Japanese cities' names. www.hackerrank.com 문제 해설 CITY 테이블에서 Japanese cities 조회를 위해 COUNTRYCODE가 JPN 데이터를 조회 OUTPUT 조건은 NAME만 조회 풀이 (MySQL) SELECT NAME FROM CITY WHERE COUNTRYCODE = "JPN";

문제 : https://www.hackerrank.com/challenges/japanese-cities-attributes/problem?isFullScreen=true Japanese Cities' Attributes | HackerRank Query the attributes of all the cities in Japan. www.hackerrank.com 문제 해설 CITY 테이블에서 Japanese City만 찾기 위해 COUNTRYCODE가 JPN인 데이터를 조회 OUTPUT 조건은 모든 칼럼에 대해 조회 풀이 (MySQL) SELECT * FROM CITY WHERE COUNTRYCODE = "JPN";

문제 : https://www.hackerrank.com/challenges/select-by-id/problem?isFullScreen=true Select By ID | HackerRank Query the details of the city with ID 1661. www.hackerrank.com 문제 해설 CITY 테이블에서 ID가 1661인 데이터 SELECT OUTPUT 조건은 모든 칼럼에 대해서 조회 풀이 (MySQL) SELECT * FROM CITY WHERE ID = 1661;

문제 : https://www.hackerrank.com/challenges/select-all-sql/problem?isFullScreen=true Select All | HackerRank Query all columns for every row in a table. www.hackerrank.com 문제 해설 CITY 테이블을 전체 조회 풀이 (MySQL) SELECT * FROM CITY;

문제 : https://www.hackerrank.com/challenges/revising-the-select-query-2/problem?isFullScreen=true Revising the Select Query II | HackerRank Query the city names for all American cities with populations larger than 120,000. www.hackerrank.com 문제 해설 CITY 테이블에서 populations이 120,000보다 크고 CountryCode가 USA인 데이터 SELECT OUTPUT 조건은 NAME 만 출력 풀이 (MySQL) SELECT NAME FROM CITY WHERE POPULATION > 120000 AND C..

문제 : https://www.hackerrank.com/challenges/revising-the-select-query/problem?isFullScreen=true Revising the Select Query I | HackerRank Query the data for all American cities with populations larger than 100,000. www.hackerrank.com 문제 해설 CITY 테이블에서 populations이 100000보다 크고 CountryCode가 USA인 데이터를 SELECT OUTPUT 조건은 모든 칼럼 조회 풀이 (MySQL) SELECT * FROM CITY WHERE POPULATION > 100000 AND COUNTRYCODE = ..