12세 이하인 여자 환자 목록 출력하기 mysql

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

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 

1. WHERE
2. SELECT + IFNULL
3. ORDER BY