문제
내가 작성한 정답 - ORACLE
SELECT WAREHOUSE_ID, WAREHOUSE_NAME, ADDRESS, NVL(FREEZER_YN,'N') AS FREEZER_YN
FROM FOOD_WAREHOUSE
WHERE ADDRESS LIKE '경기도%'
ORDER BY WAREHOUSE_ID ASC;
내가 작성한 정답 - MYSQL
SELECT WAREHOUSE_ID, WAREHOUSE_NAME, ADDRESS, IFNULL(FREEZER_YN,'N') FREEZER_YN
FROM FOOD_WAREHOUSE
WHERE ADDRESS LIKE '경기도%'
ORDER BY WAREHOUSE_ID ASC;
DATABASE에서의 null 대체값
ORACLE - NVL(COLUMN, ‘ ‘)
MYSQL - IFNULL(COLUMN, ‘ ‘)
ORACLE,MYSQL - COALESCE(COLUMN, ’ ‘)
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