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Weather Observation Station 9 Problem Weather Observation Station 9 | HackerRank Query an alphabetically ordered list of CITY names not starting with vowels. www.hackerrank.com Query the list of CITY names from STATION that do not start with vowels. Your result cannot contain duplicates. Solution SELECT DISTINCT CITY FROM STATION WHERE SUBSTR(CITY, 1, 1) NOT IN ('a','e','i','o','u'); SELECT DIST..

Weather Observation Station 8 Problem Query the list of CITY names from STATION which have vowels (i.e., a, e, i, o, and u) as both their first and last characters. Your result cannot contain duplicates. - Solution SELECT DISTINCT CITY FROM station WHERE SUBSTR(CITY,1,1) IN ('a','e','i','o','u') AND CITY LIKE '%a' or SUBSTR(CITY,1,1) IN ('a','e','i','o','u') AND CITY LIKE '%e' or SUBSTR(CITY,1,1..

Weather Observation Station 7 Problem Weather Observation Station 7 | HackerRank Query the list of CITY names ending with vowels (a, e, i, o, u) from STATION. www.hackerrank.com Query the list of CITY names ending with vowels (a, e, i, o, u) from STATION. Your result cannot contain duplicates. Input Format The STATION table is described as follows: where LAT_N is the northern latitude and LONG_W..

LIKE '_' 한 글자와 매칭 '홍____'은 '홍'자로 시작하고 4개의 character와 대응 ('홍길동', '홍lina') '%' 여러 문자와 매칭 '홍%'은 첫글자가 '홍'으로 시작 RLIKE '.' 단일 문자와 매칭 '^....$'은 영문4글자, 한글 2글자와 매칭 또는 '^.{4}$'처럼 표기해도 같은 의미임 '[...]' 괄호 내의 어느 문자와도 매칭 [ab]는 'a'나 'b'와 매칭 [a-c]는 'a'나 'b'나 'c'와 매칭 '*' 여러 문자와 매칭(0개 이상) 'a*'은 a가 몇번 반복되는 것과 매칭 '[0-9]*'는 임의의 수와 매칭 '대소문자' 구분한다. '[aA]'는 a나 A와 매칭 '[a-zA-Z]'은 모든 알파벳과 매칭 '^' 패턴 매칭에서 시작하는 문자 '^홍'은 '홍'자로..

Weather Observation Station 6 Problem Weather Observation Station 6 | HackerRank Query a list of CITY names beginning with vowels (a, e, i, o, u). www.hackerrank.com Query the list of CITY names starting with vowels (i.e., a, e, i, o, or u) from STATION. Your result cannot contain duplicates. Input Format The STATION table is described as follows: Solution -- RLIKE 사용 SELECT DISTINCT city FROM s..

Weather Observation Station 5 Problem Weather Observation Station 5 | HackerRank Write a query to print the shortest and longest length city name along with the length of the city names. www.hackerrank.com Query the two cities in STATION with the shortest and longest CITY names, as well as their respective lengths (i.e.: number of characters in the name). If there is more than one smallest or la..

Weather Observation Station 4 Problem Weather Observation Station 4 | HackerRank Find the number of duplicate CITY names in STATION. www.hackerrank.com Find the difference between the total number of CITY entries in the table and the number of distinct CITY entries in the table. The STATION table is described as follows: Solution SELECT COUNT(city) - COUNT(DISTINCT(city)) FROM station

Weather Observation Station 3 Problem Weather Observation Station 3 | HackerRank Query a list of unique CITY names with even ID numbers. www.hackerrank.com Query a list of CITY names from STATION for cities that have an even ID number. Print the results in any order, but exclude duplicates from the answer. The STATION table is described as follows: Solution SELECT distinct City FROM Station WHER..