상위 n개의 레코드 추출

📊 데이터

📌 MYSQL
limit n;

SELECT ID 
FROM Data
ORDER BY DATETIME
LIMIT 1;

📌 Oracle
ROWNUM <=1;

SELECT ID 
FROM (
	SELECT NAME 
    FROM Data
	ORDER BY DATETIME
    )
WHERE ROWNUM <=1;

참고

• https://school.programmers.co.kr/learn/courses/30/lessons/59405
• https://velog.io/@hi_potato/%ED%94%84%EB%A1%9C%EA%B7%B8%EB%9E%98%EB%A8%B8%EC%8A%A4-%EC%83%81%EC%9C%84-n%EA%B0%9C-%EB%A0%88%EC%BD%94%EB%93%9C-MySQLOracle