https://school.programmers.co.kr/learn/courses/30/lessons/131120
MONTH(날짜 데이터)
속성명 IS NOT NULL
: 속성명 값이 NULL이 아닌 행들만 추출SELECT MEMBER_ID, MEMBER_NAME, GENDER, DATE_OF_BIRTH
FROM MEMBER_PROFILE
WHERE MONTH(DATE_OF_BIRTH) = 3 AND TLNO IS NOT NULL
ORDER BY MEMBER_ID ASC