[프로그래머스/SQL] 오프라인/온라인 판매 데이터 통합하기

https://school.programmers.co.kr/learn/courses/30/lessons/131537

프로그래머스

(SELECT DATE_FORMAT(SALES_DATE, "%Y-%m-%d") as SALES_DATE, PRODUCT_ID, USER_ID, SALES_AMOUNT
FROM ONLINE_SALE  AS N
WHERE SALES_DATE LIKE '2022-03%'

UNION

SELECT DATE_FORMAT(SALES_DATE, "%Y-%m-%d") as SALES_DATE, PRODUCT_ID, NULL AS USER_ID, SALES_AMOUNT
FROM OFFLINE_SALE  AS F
WHERE SALES_DATE LIKE '2022-03%')
ORDER BY SALES_DATE, PRODUCT_ID, USER_ID