12세 이하인 여자 환자 목록 출력하기

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

• 문제 풀이

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 ASC;

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

• 실행 결과