[HackerRank] Higher Than 75 Marks_SUBSTR

문제

Query the Name of any student in STUDENTS who scored higher than  Marks. Order your output by the last three characters of each name. If two or more students both have names ending in the same last three characters (i.e.: Bobby, Robby, etc.), secondary sort them by ascending ID.

Input Format

The STUDENTS table is described as follows:

The Name column only contains uppercase (A - Z) and lowercase (a - z) letters.

Sample Input

Sample Output

Ashley Julia Belvet

 

Explanation

Only Ashley, Julia, and Belvet have Marks > . If you look at the last three characters of each of their names, there are no duplicates and 'ley' < 'lia' < 'vet'.

 

풀이

SELECT NAME
FROM STUDENTS
WHERE MARKS > 75
ORDER BY SUBSTR(NAME, LENGTH(NAME)-2, 3), ID

 

배운점

SUBSTR('문자열', 시작지점, 길이)
~ SUBSTR('ABCDE', 1, 3) = 'ABC'
~ SUBSTR(NAME, LENGTH(NAME)-2, 3) = 이름의 뒷글자 3개
→ 이름이 ArianaGrande면 LENGTH(NAME) - 2 = 12 - 2 = 10
→ ArianaGrande에서 10번째 글자부터 3글자는? nde