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SELECT T2.ANIMAL_ID, T2.NAME FROM ANIMAL_INS T1 JOIN ANIMAL_OUTS T2 ON T1.ANIMAL_ID = T2.ANIMAL_ID ORDER BY DATEDIFF(T2.DATETIME+1, T1.DATETIME) DESC LIMIT 2

SELECT ANIMAL_ID, NAME, (CASE WHEN SEX_UPON_INTAKE LIKE 'Neutered%' THEN 'O' WHEN SEX_UPON_INTAKE LIKE 'Spayed%' THEN 'O' ELSE 'X' END ) AS 중성화 FROM ANIMAL_INS ORDER BY 1

SELECT ANIMAL_ID, NAME FROM ANIMAL_INS WHERE NAME LIKE '%EL%' AND ANIMAL_TYPE = 'Dog' ORDER BY 2

SELECT ANIMAL_ID, NAME, SEX_UPON_INTAKE FROM ANIMAL_INS WHERE NAME IN ('Lucy', 'Ella', 'Pickle', 'Rogan', 'Sabrina', 'Mitty') ORDER BY 1

-- SUBSTRING 메서드를 활용해 문자열 슬라이싱을 할 수 있으며 -- CONCAT 시 다른 요소와 구분해야 한다면 꼭 ' '를 추가해 빈칸을 만들어 주기! SELECT T2.USER_ID, T2.NICKNAME, CONCAT(T2.CITY, ' ', T2.STREET_ADDRESS1, ' ', T2.STREET_ADDRESS2) AS 전체주소, CONCAT(LEFT(T2.TLNO, 3), '-', substring(T2.TLNO, 4, 4), '-', SUBSTRING(T2.TLNO, 8, 4)) AS 전화번호 FROM USED_GOODS_BOARD T1 JOIN USED_GOODS_USER T2 ON T1.WRITER_ID = T2.USER_ID GROUP BY T1.WRITER_ID HAVIN..

SELECT CAR_ID, CAR_TYPE, DAILY_FEE, OPTIONS FROM CAR_RENTAL_COMPANY_CAR WHERE OPTIONS LIKE '%네비게이션%' ORDER BY 1 DESC

-- 날짜간 비교는 DATEDIFF 잊지 말기! SELECT HISTORY_ID, CAR_ID, DATE_FORMAT(START_DATE, '%Y-%m-%d') AS START_DATE, DATE_FORMAT(END_DATE, '%Y-%m-%d') AS END_DATE, IF (DATEDIFF(END_DATE,START_DATE) >= 30, '장기 대여', '단기 대여') AS RENT_TYPE FROM CAR_RENTAL_COMPANY_RENTAL_HISTORY WHERE START_DATE LIKE '2022-09%' ORDER BY HISTORY_ID DESC

SELECT T2.FLAVOR FROM FIRST_HALF T1, JULY T2 WHERE T1.FLAVOR = T2.FLAVOR GROUP BY T2.FLAVOR ORDER BY SUM(T2.TOTAL_ORDER)+T1.TOTAL_ORDER DESC LIMIT 3

-- CONCAT으로 문자 합쳐서 원하는 대로 출력하기 SELECT CONCAT('/home/grep/src/', T2.BOARD_ID, '/', T2.FILE_ID, T2.FILE_NAME, T2.FILE_EXT) AS FILE_PATH FROM USED_GOODS_BOARD T1 JOIN USED_GOODS_FILE T2 ON T1.BOARD_ID = T2.BOARD_ID WHERE T1.VIEWS = (SELECT MAX(VIEWS) AS VIEWS FROM USED_GOODS_BOARD LIMIT 1 ) ORDER BY T2.FILE_ID DESC

SELECT NAME, DATETIME FROM ANIMAL_INS WHERE ANIMAL_ID NOT IN (SELECT ANIMAL_ID FROM ANIMAL_OUTS ) ORDER BY 2 LIMIT 3