[MYSQL] PERCENT_RANK()

https://school.programmers.co.kr/learn/courses/30/lessons/301649

프로그래머스

 

WITH RK_TBL AS (
SELECT ID, 
    PERCENT_RANK() OVER(ORDER BY SIZE_OF_COLONY DESC) AS PER
    FROM ECOLI_DATA
)

SELECT ID,
CASE
    WHEN PER <= 0.25 THEN 'CRITICAL'
    WHEN PER <= 0.5 THEN 'HIGH'
    WHEN PER <= 0.75 THEN 'MEDIUM'
    ELSE 'LOW'
END AS COLONY_NAME
FROM RK_TBL
ORDER BY ID

 

PERCENT_RANK(): 일반적인 RANK 함수와 다르게 순위를 백분율로 표현.