프로그래머스 12세 이하인 여자 환자 목록 출력하기

https://school.programmers.co.kr/learn/courses/30/lessons/132201

프로그래머스

SELECT PT_NAME, PT_NO, GEND_CD, AGE, IFNULL(TLNO, 'NONE') AS TLNO
FROM PATIENT
WHERE AGE <= 12 AND GEND_CD = 'W'
ORDER BY AGE DESC, PT_NAME;

SELECT PT_NAME, PT_NO, GEND_CD, AGE,
    CASE
        WHEN TLNO IS NULL THEN 'NONE'
        ELSE TLNO
    END
AS TLNO
FROM PATIENT
WHERE AGE <= 12 AND GEND_CD = 'W'
ORDER BY AGE DESC, PT_NAME;