USE Study
GO

-- ±×·ìº° ¼øÀ§ ÁöÁ¤
SELECT ENAME, SALARY, DNO, RANK() OVER (PARTITION BY DNO ORDER BY SALARY DESC) AS RANK_DEPT
FROM EMPLOYEE

-- °¢ ±×·ì ±Þ¿©±âÁØ 2À§ÀÎ »ç¿øÀÇ ºÎ¼­Á¤º¸, À̸§, ±Þ¿©, ¼øÀ§ Á¶È¸
SELECT *
FROM 
	(SELECT DNO, ENAME, SALARY, RANK() OVER (PARTITION BY DNO ORDER BY SALARY DESC) AS RANK_VALUE
	FROM EMPLOYEE) AS TEMP
WHERE RANK_VALUE = 2

-- ±×·ìº° Áý´Ü ÇÔ¼ö »ç¿ë
SELECT DISTINCT DNO, AVG(SALARY) OVER (PARTITION BY DNO) FROM EMPLOYEE
SELECT DISTINCT DNO, AVG(SALARY) FROM EMPLOYEE GROUP BY DNO