[프로그래머스_mysql] 12세 이하인 여자 환자 목록 출력하기

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

프로그래머스

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문제

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풀이

SELECT PT_NAME, PT_NO, GEND_CD, AGE, 
CASE WHEN TLNO IS NULL THEN 'NONE'
    WHEN TLNO IS NOT NULL THEN TLNO END 'TLNO'
FROM PATIENT
WHERE AGE <=12 AND GEND_CD='w'
ORDER BY AGE DESC, PT_NAME ASC;