[프로그래머스] 오프라인/온라인 판매 데이터 통합하기

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

프로그래머스

 

내 풀이

SELECT DATE_FORMAT(SALES_DATE,'%Y-%m-%d') AS SALES_DATE, PRODUCT_ID, USER_ID, SALES_AMOUNT 
FROM ONLINE_SALE
WHERE YEAR(SALES_DATE) = '2022' AND MONTH(SALES_DATE) = '03'

UNION

SELECT DATE_FORMAT(SALES_DATE,'%Y-%m-%d') AS SALES_DATE, PRODUCT_ID, NULL AS USER_ID, SALES_AMOUNT 
FROM OFFLINE_SALE
WHERE YEAR(SALES_DATE) = '2022' AND MONTH(SALES_DATE) = '03'

ORDER BY SALES_DATE ASC, PRODUCT_ID ASC, USER_ID ASC ;