[프로그래머스/SQL 고득점 Kit] IS NULL ALL SOLVE

경기도에 위치한 식품창고 목록 출력하기

https://school.programmers.co.kr/learn/courses/30/lessons/131114

프로그래머스

SELECT WAREHOUSE_ID, WAREHOUSE_NAME, ADDRESS, IFNULL(FREEZER_YN, "N") as FREEZER_YN
FROM FOOD_WAREHOUSE
WHERE ADDRESS like "경기도%"
ORDER BY WAREHOUSE_ID

 

이름이 없는 동물의 아이디

https://school.programmers.co.kr/learn/courses/30/lessons/59039

프로그래머스

SELECT ANIMAL_ID
FROM ANIMAL_INS
WHERE NAME IS NULL
ORDER BY ANIMAL_ID

 

이름이 있는 동물의 아이디

https://school.programmers.co.kr/learn/courses/30/lessons/59407

프로그래머스

SELECT ANIMAL_ID
FROM ANIMAL_INS
WHERE NAME IS NOT NULL
ORDER BY ANIMAL_ID

 

NULL 처리하기

https://school.programmers.co.kr/learn/courses/30/lessons/59410

프로그래머스

SELECT ANIMAL_TYPE, IFNULL(NAME, "No name") as NAME, SEX_UPON_INTAKE
FROM ANIMAL_INS
ORDER BY ANIMAL_ID

 

나이 정보가 없는 회원 수 구하기

https://school.programmers.co.kr/learn/courses/30/lessons/131528

프로그래머스

SELECT count(USER_ID) as USERS
FROM USER_INFO
WHERE AGE is null