https://school.programmers.co.kr/learn/courses/30/lessons/131113
포인트!
SELECT
ORDER_ID,
PRODUCT_ID,
DATE_FORMAT(OUT_DATE,'%Y-%m-%d') AS OUT_DATE,
CASE
WHEN OUT_DATE<='2022-05-01' THEN '출고완료'
WHEN OUT_DATE>'2022-05-01' THEN '출고대기'
ELSE '출고미정'
END AS '출고여부'
FROM
FOOD_ORDER
ORDER BY
ORDER_ID
쉽다..
근데 문제에는 "출고 완료"로 출력하라면서 띄어쓰기 안써야 정답처리해주드라~_~