[Programmers Lv.4] 오프라인/온라인 판매 데이터 통합하기 - 131537

Question

 

ONLINE_SALE 테이블과 OFFLINE_SALE 테이블에서 2022년 3월의 오프라인/온라인 상품 판매 데이터의 판매 날짜, 상품ID, 유저ID, 판매량을 출력하는 SQL문을 작성해주세요. OFFLINE_SALE 테이블의 판매 데이터의 USER_ID 값은 NULL 로 표시해주세요. 결과는 판매일을 기준으로 오름차순 정렬해주시고 판매일이 같다면 상품 ID를 기준으로 오름차순, 상품ID까지 같다면 유저 ID를 기준으로 오름차순 정렬해주세요.

 

 

Code

 

SELECT DATE_FORMAT(SALES_DATE,'%Y-%m-%d') SALES_DATE, 
       PRODUCT_ID, 
       USER_ID, 
       SALES_AMOUNT
FROM   ONLINE_SALE
WHERE  SALES_DATE LIKE '2022-03%'
UNION
SELECT DATE_FORMAT(SALES_DATE,'%Y-%m-%d') SALES_DATE, 
       PRODUCT_ID, 
       NULL,
       SALES_AMOUNT
FROM   OFFLINE_SALE
WHERE  SALES_DATE LIKE '2022-03%'
ORDER BY 1, 2, 3

 

now me

On my github